Improving scheduling for wireless communication systems

Abstract

The present invention relates to a 5G or 6G communication system for supporting higher data transmission rates. An apparatus and method for scheduling enhancement for a wireless communication system. A method for receiving a PDCCH includes receiving from a first cell first information for a first search space set for scheduling for the first cell and receiving from a second cell second information for a second search space set for scheduling for the first cell. The method includes determining a first number of PDCCH receptions via a first number of non-overlapping control channel elements (CCEs) on the first cell in a first slot based on the first search space set and identifying at least one of: the first number of PDCCH receptions exceeds a predetermined number of PDCCH receptions, and the first number of non-overlapping CCEs exceeds a predetermined number of non-overlapping CCEs. The method further includes canceling PDCCH receptions corresponding only to a third search space set in the first search space set.

Description

[Technical Field]

[0001] The present invention relates to wireless communication systems in general, and more specifically to scheduling improvements for wireless communication systems, including scheduling for dynamic spectrum sharing and cross-carrier scheduling improvements. [Background technology]

[0002] 5G mobile communication technology defines a wide frequency band to enable rapid transmission speeds and new services, and can be implemented not only in bands "below 6GHz" such as 3.5GHz, but also in bands "above 6GHz" known as millimeter waves (mmWave), such as 28GHz and 39GHz. Furthermore, in the case of 6G mobile communication technology (also known as Beyond 5G systems), implementation in the terahertz band (e.g., 95GHz to 3THz band) is being considered to achieve transmission speeds 50 times faster and ultra-low latency reduced to one-tenth compared to 5G mobile communication technology.

[0003] In the early stages of 5G mobile communication technology, standardization progressed on various aspects, including beamforming and massive MIMO to mitigate path loss and increase transmission distance in mmWave, dynamic operation of various numerology (such as operation of multiple subcarrier spacings) and slot formats for efficient utilization of ultra-high frequency resources, initial access technologies to support multiple beam transmission and broadband, definition and operation of BandWidth Parts (BWPs), new channel coding methods such as Low Density Parity Check (LDPC) codes for high-capacity data transmission and Polar Code for reliable transmission of control information, L2 pre-processing, and network slicing to provide dedicated networks for specific services.

[0004] Currently, considering the services that 5G mobile communication technology was intended to support, discussions are underway to improve and enhance the performance of early 5G mobile communication technology. Physical layer standardization is progressing for technologies such as V2X (Vehicle-to-Everything), which assists autonomous vehicles in making driving decisions based on their own location and status information transmitted by the vehicle and increases user convenience; NR-U (New Radio Unlicensed), which aims for system operation that complies with various regulatory requirements on unlicensed spectrum; NR UE Power Saving; NTN (Non-Terrestrial Network), which is direct UE-satellite communication to ensure coverage in areas where communication with the terrestrial network is impossible; and positioning.

[0005] Furthermore, standardization in the field of wireless interface architecture / protocols is underway for technologies such as IIoT (Industrial Internet of Things), which supports new services through collaboration and integration with other industries; IAB (Integrated Access and Backhaul), which provides nodes for expanding network service areas by integrating wireless backhaul links and access links; mobility enhancements including conditional handover and DAPS (Dual Active Protocol Stack) handover; and 2-step random access (2-step RACH for NR), which simplifies random access procedures. Furthermore, standardization in the system architecture / services domain is underway for 5G baseline architectures (e.g., Service-based Architecture, Service-based Interface) for the integration of Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, as well as for Mobile Edge Computing (MEC) where services are provided based on the location of the UE.

[0006] When such 5G mobile communication systems become commercialized, the explosively increasing number of connected devices will be connected to the communication network, which is expected to necessitate enhancements to the functionality and performance of 5G mobile communication systems and the integrated operation of connected devices. To this end, new research is planned on augmented reality (XR) to efficiently support AR (Augmented Reality), VR (Virtual Reality), and MR (Mixed Reality), as well as on improving 5G performance and reducing complexity using artificial intelligence (AI) and machine learning (ML), AI service support, metaverse service support, and drone communications.

[0007] Furthermore, the development of such 5G mobile communication systems can serve as the basis for the development of new waveforms to guarantee terahertz band coverage in 6G mobile communication technology, multiplex antenna transmission technologies such as Full Dimensional MIMO (FD-MIMO), Array Antennas, and Large Scale Antennas, metamaterial-based lenses and antennas to improve terahertz band signal coverage, high-dimensional spatial multiplexing technologies using Orbital Angular Momentum (OAM), and Reconfigurable Intelligent Surface (RIS) technologies, as well as full-duplex technologies to improve frequency efficiency and system network improvements in 6G mobile communication technology, satellites, AI-based communication technologies that utilize AI (Artificial Intelligence) from the design stage and internalize end-to-end AI support functions to achieve system optimization, and next-generation distributed computing technologies that realize services of complexity exceeding the limits of UE computing power by utilizing ultra-high-performance communication and computing resources. [Overview of the project] [Problems that the invention aims to solve]

[0008] The present invention has been made in view of the problems in the above-mentioned conventional communication systems, and the object of the present invention is to provide a wireless communication system that includes improved scheduling for dynamic spectrum sharing and cross-carrier scheduling. [Means for solving the problem]

[0009] According to one aspect of the present invention, a method performed by a terminal (user equipment) in a wireless communication system, from a base station, For self-carrier and cross-carrier scheduling on the primary cell. The steps include receiving setting information for the alpha value, and receiving from the base station, The primary cellScheduling for the primary cell from and receiving information for setting scheduling for the primary cell from a secondary cell; before monitoring PDCCH (physical downlink control channel) candidates for scheduling for the primary cell, and per slot Rimo being monitored Scheduled from the aforementioned primary cell The number of PDCCH candidates does not exceed a first value, and the number of non-overlapping CCEs (control channel elements) monitored per slot does not exceed a second value. For the first value, the α value is multiplied by the minimum value between the maximum number of PDCCH candidates in a slot for the first SCS (subcarrier spacing) and the total number of PDCCH candidates in a slot for the first SCS. For the second value, the α value is multiplied by the minimum value between the maximum number of non-overlapping CCEs in a slot for the first SCS and the total number of non-overlapping CCEs in a slot for the first SCS Scheduled from the aforementioned primary cell being multiplied inside by the minimum value between the maximum number of non-overlapping CCEs in a slot for the first SCS and the total number of non-overlapping CCEs in a slot for the first SCS Therefore, the first SCS for the primary cell is smaller than or equal to the second SCS for the secondary cell. characterized in that.

Advantages of the Invention

[0010] In the method for receiving a PDCCH according to the present invention, a communication method with improved scheduling for dynamic spectrum sharing and cross-carrier scheduling is provided.

Brief Description of the Drawings

[0011] For a more complete understanding of the present invention and its advantages, reference is now made to the following description taken in conjunction with the accompanying drawings, in which like reference numerals indicate like parts. [Figure 1] FIG. shows an exemplary wireless network according to an embodiment of the present invention. [Figure 2] FIG. shows an exemplary BS according to an embodiment of the present invention. [Figure 3] This figure shows an exemplary UE according to an embodiment of the present invention. [Figure 4] This figure shows an exemplary wireless transmission and reception path according to an embodiment of the present invention. [Figure 5] This figure shows an exemplary wireless transmission and reception path according to an embodiment of the present invention. [Figure 6] This flowchart illustrates an exemplary method for scheduling unicast physical downlink shared channel (PDSCH) reception and multicast and broadcast service (MBS) PDSCH reception from two scheduling cells on a scheduled cell according to an embodiment of the present invention. [Figure 7] This flowchart illustrates an exemplary method for switching from a first scheduled cell to a second scheduled cell for a cell scheduled according to an embodiment of the present invention. [Figure 8] This flowchart illustrates an exemplary method for setting the cross-bandwidth portion (BWP) of a linked search space set for cross-carrier scheduling according to an embodiment of the present invention. [Figure 9] This flowchart illustrates an exemplary method for PDCCH overbooking and drop when monitored PDCCH candidates and non-overlapping control channel elements (CCEs) for scheduled cells are counted individually for each scheduled cell according to an embodiment of the present invention. [Figure 10] This flowchart illustrates an exemplary method for PDCCH overbooking and drop-offs for a primary cell scheduled by both a primary cell and a special secondary cell (sSCell) according to an embodiment of the present invention. [Figure 11]This flowchart illustrates exemplary methods for PDCCH overbooking and drop of the search space set when monitored PDCCH candidates and non-overlapping CCEs for scheduled cells are jointly counted across two scheduled cells according to embodiments of the present invention. [Figure 12] This flowchart illustrates an exemplary method for a search space set drop procedure when the scheduled cell is the primary cell and the scheduling cell is the primary cell and sSCell, according to an embodiment of the present invention. [Figure 13] This figure shows the structure of a UE according to an embodiment of the present invention. [Figure 14] This figure shows the structure of a base station according to an embodiment of the present invention. [Modes for carrying out the invention]

[0012] [Best form] The present invention relates to scheduling improvements for wireless communication systems, including scheduling for dynamic spectrum sharing and cross-carrier scheduling improvements. In one embodiment, a method for receiving a PDCCH (physical downlink control channel) is provided. The method includes receiving first information for a first search space set for scheduling from a first cell to a first cell, and second information for a second search space set for scheduling from a second cell to a first cell. The method includes the steps of determining a first number of PDCCH receptions in a first slot via a first number of non-overlapping control channel elements (CCEs) on a first cell based on a first search space set, and identifying at least one of the following: the first number of PDCCH receptions exceeds a predetermined number of PDCCH receptions, and the first number of non-overlapping CCEs exceeds a predetermined number of non-overlapping CCEs. The method further includes the step of canceling PDCCH receptions that correspond only to the third search space set among the first search space set.

[0013] In another embodiment, a user terminal (UE) is provided. The UE includes a transceiver configured to receive first information for a first search space set for scheduling from a first cell to a first cell, and second information for a second search space set for scheduling from a second cell to a first cell. The UE further includes a processor that is operablely coupled to the transceiver. The processor is configured to determine a first number of PDCCH receptions via a first number of non-overlapping control channel elements (CCEs) on a first cell in a first slot based on a first search space set, and to identify at least one of the following: the first number of PDCCH receptions exceeds a predetermined number of PDCCH receptions, and the first number of non-overlapping CCEs exceeds a predetermined number of non-overlapping CCEs. The transceiver is further configured to cancel PDCCH reception corresponding only to the third search space set within the first search space set.

[0014] In yet another embodiment, a base station (BS) is provided. The BS includes a transceiver configured to transmit first information for a first search space set for scheduling from a first cell to a first cell, second information for a second search space set for scheduling from a second cell to a first cell, a scaling factor α for scaling the maximum number of PDCCHs (physical downlink control channels) and the maximum number of non-overlapping CCEs on the first cell in the first slot based on the first search space set, and also to transmit a PDCCH on the first cell or a PDCCH on the second cell in the first slot.

[0015] Other technical features will be readily apparent to those skilled in the art from the drawings, description and claims below. Before proceeding into a detailed explanation, it may be helpful to define certain words and phrases used throughout this patent specification. The term “couple” and its derivatives refer to direct or indirect communication between two or more elements, regardless of whether those elements are in physical contact with each other. The terms “transmit,” “receive,” and “communicate,” as well as their derivatives, include both direct and indirect communication. The terms “include” and “comprise,” as well as their derivatives, mean to include without restriction. The term "or" is an inclusive term meaning "and / or". The phrase "associated with" and its derivatives mean to include, be included within, connect with, contain, be contained within, connect to or with, couple to or with, be communicable with, cooperate with, interleave, juxtapose, be proximate to, be bound to or with, have, have a property of, have a relationship to or with, etc.

[0016] The term "controller" refers to a device, system, or part thereof that controls at least one action. Such controllers can be implemented in hardware, a combination of hardware and software, and / or firmware. Functions associated with a specific controller can be processed locally or remotely, centrally, or distributed. The phrase “at least one” means that, when used with a list of items, one or more different combinations of the listed items may be used. For example, “at least one of A, B, and C” includes one of the following combinations: A, B, C, A and B, A and C, B and C, and A, B, and C.

[0017] Furthermore, the various functions described below may be implemented or supported by one or more computer programs, each of which is formed in computer-readable program code and implemented in a computer-readable medium. The terms “application” and “program” refer to one or more computer programs, software components, instruction sets, procedures, functions, objects, classes, instances, associated data, or parts thereof configured for implementation in suitable computer-readable program code. The phrase “computer-readable program code” includes all types of computer code, including source code, object code, and executable code.

[0018] The phrase “computer-readable media” includes any type of media that can be accessed by a computer, such as ROM (read-only memory), RAM (random access memory), hard disk drives, compact discs (CDs), digital video discs (DVDs), or any other type of memory. "Non-transient" computer-readable media excludes wired, wireless, optical, temporary electrical, or other communication links that transmit signals. Non-temporary computer-readable media include media on which data is permanently stored, and media on which data is stored and later overwritten, such as re-recordable optical discs or erasable memory devices.

[0019] Definitions for other specific words and phrases are provided throughout this patent specification. Those skilled in the art should understand that in many, if not most, cases such definitions may apply not only to the past use but also to the future use of words and phrases defined in this way.

[0020] [Modes for carrying out the invention] This application claims priority under 35 U.S.C. § 119(e) to U.S. Provisional Patent Application No. 63 / 164,331 and U.S. Provisional Patent Application No. 63 / 164,340, filed on 22 March 2021. The entire contents of the above provisional patent application are incorporated herein by reference.

[0021] Figures 1 to 12, and the various embodiments used in this patent specification to illustrate the principles of the present invention, are for illustrative purposes only and should not be construed in any way as limiting the scope of the present invention. Those skilled in the art will understand that the principle of the present invention can be implemented in any appropriately configured system or device.

[0022] The following documents, namely 3GPP TS 38.211 Rel-16 v16.4.0,“NR;Physical channels and modulation”(“REF1”);3GPP TS 38.212 Rel-16 v16.4.0,“NR;Multiplexing and channel coding”(“REF2”);3GPP TS 38.213 Rel-16 v16.4.0,“NR;Physical layer procedures for control”(“REF3”);3GPP TS 38.214 Rel-16 v16.4.0,“NR;Physical layer procedures for data”(“REF4”);3GPP TS 38.321 Rel-16 v16.3.0,“NR;Medium Access Control (MAC) protocol specification”(“REF5”);3GPP TS 38.331 Rel-16 v16.3.1,“NR;Radio The Resource Control (RRC) protocol specification ("REF6"), 3GPP TS 38.300 Rel-16 v16.4.0, "NR; NR and NG-RAN Overall Description; Stage 2" ("REF7"), and 3GPP TS 38.133 Rel-16 v16.4.0, "NR; NR Requirements for support of radio resource management" ("REF8") are included by reference to the present invention as if they were fully described herein.

[0023] Since the establishment of 4G communication systems, efforts have been focused on developing improved 5G or pre-5G / NR communication systems to meet the increasing demand for wireless data traffic. For these reasons, 5G or pre-5G communication systems are also called "Beyond 4G networks" or "Post LTE (long term evolution) systems." 5G communication systems are expected to be implemented in higher frequency (mmWave) bands, such as 28GHz or 60GHz, to achieve higher data transmission rates, or in lower frequency bands, such as 6GHz, to enable robust coverage and mobility support.

[0024] To reduce radio wave propagation loss and increase transmission distance, beamforming, MIMO (Massive Multiple-Input Multiple-Output), FD-MIMO (Full Dimensional MIMO), array antennas, analog beamforming, and large-scale antenna technologies are discussed for 5G communication systems. Furthermore, development is underway to improve the system network in 5G communication systems, based on features such as advanced small cells, cloud radio access networks (RANs), ultra-high density networks, D2D (device-to-device) communication, wireless backhaul, mobile networks, coordinated communication, CoMP (coordinated multi-points), and reception interference rejection. The discussion of 5G systems and associated frequency bands is for reference only, as certain embodiments of the present invention can be implemented in 5G systems. However, the present invention is not limited to 5G systems or related frequency bands, and embodiments of the present invention can be utilized in connection with any frequency band. For example, aspects of the present invention can also be applied to the deployment of 5G, 6G, or even subsequent releases that can utilize the terahertz (THz) band.

[0025] Depending on the network type, the term “base station (BS)” may refer to a component (or set of components) configured to provide radio access to a network, such as a transmit point (TP), transmit-receive point (TRP), enhanced base station (eNodeB or eNB), gNB, macrocell, femtocell, WiFi access point (AP), satellite, or other radio-operable device. A base station can provide wireless access via one or more wireless communication protocols, such as 5G 3GPP® New Radio Interface / Access (NR), LTE, LTE-A (LTE-advanced), HSPA (High Speed ​​Packet Access), Wi-Fi 802.11a / b / g / n / ac, etc.

[0026] The terms “BS,” “gNB,” and “TRP” are used interchangeably in this disclosure to refer to network infrastructure components that provide wireless access to remote terminals. Furthermore, depending on the network type, the term "User Terminal (UE)" may refer to any component such as a mobile station, subscriber station, remote terminal, radio terminal, receiving point, vehicle, or user equipment. For example, UEs could include mobile phones, smartphones, monitoring devices, alarm systems, vehicle management systems, asset tracking systems, automobiles, desktop computers, entertainment systems, infotainment systems, vending machines, electricity meters, water meters, gas meters, security devices, sensor devices, and home appliances.

[0027] Figures 1 to 3 below illustrate various embodiments implemented in wireless communication systems and using OFDM (orthogonal frequency division multiplexing) or OFDMA (orthogonal frequency division multiple access) communication technologies. The descriptions in Figures 1 to 3 do not imply any physical or structural limitations on the system in which different embodiments may be implemented. Different embodiments of the present invention can be implemented in any appropriately configured communication system.

[0028] Figure 1 shows an exemplary wireless network 100 according to an embodiment of the present invention. The wireless network embodiment shown in Figure 1 is for illustrative purposes only. Other embodiments of the wireless network 100 may be used without departing from the scope of the present invention. As shown in Figure 1, the wireless network 100 includes base stations (hereinafter referred to as BS) 101 (e.g., gNB), BS 102, and BS 103. BS101 communicates with BS102 and BS103. BS101 also communicates with at least one network 130, for example, the Internet, a dedicated Internet Protocol (IP) network, or other data network.

[0029] BS102 provides wireless broadband access to network 130 to a plurality of first user terminals (UEs) located within the coverage area 120 of BS102. The first group of UEs includes UE111 which may be located in a small business (SB), UE112 which may be located in a large enterprise (E), UE113 which may be located in a Wi-Fi hotspot (HS), UE114 which may be located in a first residential area (R), UE115 which may be located in a second residential area (R), and UE116 which may be a mobile device (M) such as a cell phone, wireless laptop, or wireless PDA. BS103 provides wireless broadband access to network 130 to a second or more UEs within the coverage area 125 of BS103.

[0030] The second set of UEs includes UE115 and UE116. In some embodiments, one or more of the BS (101-103) can communicate with each other and with the UE (111-116) using 5G / NR, LTE (long term evolution), LTE-A (long term evolution-advanced), WiMAX, WiFi, or other wireless communication technologies. The dotted lines indicate the approximate extent of the coverage area (120, 125), which is shown as a roughly circular shape for illustrative and explanatory purposes only. It should be clearly understood that coverage areas associated with BS, such as coverage areas (120, 125), may have other forms, including irregular forms, due to the configuration of BS and changes in the radio environment associated with natural and artificial obstacles.

[0031] As will be described in more detail below, one or more of the UEs (111-116) include circuits, programming, or a combination thereof for scheduling to improve dynamic spectrum sharing and cross-carrier scheduling. In certain embodiments, one or more of BS(101-103) include circuits, programming, or combinations thereof for scheduling to improve dynamic spectrum sharing and cross-carrier scheduling.

[0032] Figure 1 shows an example of a wireless network, but various modifications can be made to Figure 1. For example, a wireless network can include any number of BSs and any number of UEs in any suitable arrangement. Furthermore, BS10 can communicate directly with any number of UEs and provide them with wireless broadband access to network 130. Similarly, each BS (102, 103) can communicate directly with network 130 and provide the UE with direct wireless broadband access to network 130. Additionally, BS (101, 102, and / or 103) may provide access to other or additional external networks, such as external telephone networks or other types of data networks.

[0033] Figure 2 shows an exemplary gNB102 according to an embodiment of the present invention. The embodiment of BS102 shown in Figure 2 is for illustrative purposes only, and BS(101, 103) in Figure 1 may have the same or similar configuration. However, BS consists of a variety of configurations, and Figure 2 does not limit the scope of the present invention to any specific implementation of BS. As shown in Figure 2, BS102 includes multiple antennas (205a to 205n), multiple RF (radio frequency) transceivers (210a to 210n), a transmit (TX) processing circuit 215, and a receive (RX) processing circuit 220. The BS102 also includes a controller / processor 225, memory 230, and a backhaul or network interface 235. For example, UE116 may contain more or fewer components than those described above. Furthermore, UE116 corresponds to the UE in Figure 14.

[0034] The RF transceivers (210a-210n) receive incoming RF signals, such as signals transmitted by the UE within network 100, from the antennas (205a-205n). RF transceivers (210a to 210n) down-convert the received RF signal to generate an IF or baseband signal. The IF or baseband signal is transmitted to the RX processing circuit 220, which processes the baseband or IF signal by filtering, decoding, and / or digitizing it to generate a baseband signal. The RX processing circuit 220 transmits the processed baseband signal to the controller / processor 225 for further processing.

[0035] The TX processing circuit 215 receives analog or digital data (e.g., audio data, web data, email, or two-way video game data) from the controller / processor 225. The TX processing circuit 215 encodes, multiplexes, and / or digitizes the outgoing baseband data to generate a processed baseband or IF signal. The RF transceivers (210a to 210n) receive the baseband or IF signal that has been processed for transmission from the TX processing circuit 215, and upconvert that baseband or IF signal into an RF signal that is transmitted via the antennas (205a to 205n).

[0036] The controller / processor 225 includes one or more processors or other processing units that control the overall operation of the BS102. For example, the controller / processor 225 controls the reception of uplink channel signals and the transmission of downlink channel signals by the RF transceivers (210a~210n), the RX processing circuit 220, and the TX processing circuit 215 according to well-known principles. The controller / processor 225 can also support additional features such as more advanced wireless communication capabilities. For example, the controller / processor 225 can support dynamic spectrum sharing and scheduling for improved cross-carrier scheduling. Any of the various other functions may be supported by the controller / processor 225 in the BS102.

[0037] In some embodiments, the controller / processor 225 includes at least one microprocessor or microcontroller. Furthermore, the controller / processor 225 executes programs and other processes that reside in memory 230, such as the operating system. The controller / processor 225 moves data into or out of memory 230 in response to requests from the executing process. In some embodiments, the controller / processor 225 supports inter-entity communication such as web real-time communication (RTC). For example, the controller / processor 225 moves data in and out of memory 230 by the running process.

[0038] Furthermore, the controller / processor 225 is coupled to a backhaul or network interface 235. The backhaul or network interface 235 allows BS102 to communicate with other devices or systems via a backhaul connection or a network. The network interface 235 can support communication via any suitable wired or wireless connection ( ) (hereinafter, ( ) is used to indicate that there are multiple forms). For example, if BS102 is implemented as part of a cellular communication system (e.g., one supporting 5G / NR, LTE, or LTE-A), the network interface 235 allows BS102 to communicate with other BSs via a wired or wireless backhaul connection.

[0039] When BS102 is implemented as an access point, the network interface 235 allows BS102 to transmit to a larger network (e.g., the Internet) via a wired or wireless local area network or via a wired or wireless connection. The network interface 235 includes any suitable configuration that supports wired or wireless connections, such as Ethernet or communication via an RF transceiver. Memory 230 is coupled to the controller / processor 225. A portion of the memory 230 may include RAM, and another portion of the memory 230 may include flash memory or other ROM.

[0040] Figure 2 shows an example of BS102, but various modifications can be made to Figure 2. For example, BS102 can contain any number of each component shown in Figure 2. As one specific example, an access point may include multiple interfaces 235, and the controller / processor 225 may support routing capabilities to route data between different network addresses. Other specific examples include a single instance of the TX processing circuit 215 and a single instance of the RX processing circuit 220, but the BS102 can include multiple instances for each (e.g., one per RF transceiver). Furthermore, the various components shown in Figure 2 may be combined, further subdivided, or omitted, and additional components may be added depending on specific needs.

[0041] Figure 3 shows an exemplary UE116 according to an embodiment of the present invention. The embodiment of UE116 shown in Figure 3 is for illustrative purposes only, and UE(111~115) in Figure 1 may have the same or similar configuration. However, UEs consist of diverse configurations, and Figure 3 does not limit the scope of the invention to any particular implementation of the UE. For example, UE116 includes more or fewer components than those described above. Furthermore, UE116 corresponds to the UE in Figure 13.

[0042] As shown in Figure 3, the UE116 includes an antenna 305, an RF transceiver 310, a TX processing circuit 315, a microphone 320, and a receiving (RX) processing circuit 325. The UE116 also includes a speaker 330, a processor 340, an input / output (I / O) interface (IF) 345, an input device 350, a display 355, and memory 360. Memory 360 includes an operating system (OS) 361 and one or more applications 362.

[0043] The RF transceiver 310 receives the received RF signal transmitted by the BS of network 100 from the antenna 305. The RF transceiver 310 downconverts the received RF signal to generate an intermediate frequency (IF) or baseband signal. The IF or baseband signal is transmitted to the RX processing circuit 325, which processes the baseband or IF signal by filtering, decoding, and / or digitizing it to generate a baseband signal. The RX processing circuit 325 either transmits the processed baseband signal to the speaker 330 (e.g., audio data) or to the processor 340 for further processing (e.g., web browsing data).

[0044] The TX processing circuit 315 receives analog or digital audio data from the microphone 320, or other baseband data (e.g., web data, email, or two-way video game data) from the processor 340. The TX processing circuit 315 encodes, multiplexes, and / or digitizes the transmitted baseband data to generate a processed baseband or IF signal. The RF transceiver 310 receives the baseband or IF signal transmitted from the TX processing circuit 315 and upconverts the baseband or IF signal to an RF signal transmitted via the antenna 305.

[0045] The processor 340 may include one or more processors or other processing units and controls the overall operation of the UE116 by executing the OS 361 stored in the memory 360. For example, the processor 340 controls the reception of forward channel signals and the transmission of reverse channel signals by the RF transceiver 310, the RX processing circuit 325, and the TX processing circuit 315 according to well-known principles. In some embodiments, the processor 340 includes at least one microprocessor or microcontroller. Processor 340 also runs other processes and programs that reside in memory 360, such as processes for beam management. The processor 340 moves data into or out of memory 360 in response to requests from the executing process.

[0046] In some embodiments, the processor 340 is configured to execute the application 362 based on the OS 361 or by signals received from the BS or operator. Furthermore, the processor 340 is coupled to an I / O interface 345 that provides the UE116 with the ability to connect to other devices such as laptop computers and handheld computers. The I / O interface 345 is a communication path between the peripheral device and the processor 340. Furthermore, the processor 340 is coupled to the input device 350. The UE116 operator inputs data into the UE116 using the input device 350.

[0047] The input device 350 may be a keyboard, touchscreen, mouse, trackball, voice input device, or other device that can act as a user interface allowing the user to interact with the UE116. For example, the input device 350 may include speech recognition processing, allowing the user to input voice commands. In other examples, the input device 350 may include a touch panel, a (digital) pen sensor, a key, or an ultrasonic input device. The touch panel can recognize touch input using at least one of the following methods: capacitive, depressurized, infrared, or ultrasonic.

[0048] The processor 340 is also coupled to the display 355. The display 355 may be, for example, a liquid crystal display, a light-emitting diode display, or other display capable of rendering text and / or at least limited graphics from a website. Memory 360 is coupled to processor 340. A portion of the memory 230 may include random access memory (RAM), and another portion of the memory 230 may include flash memory or other read-only memory (ROM).

[0049] Figure 3 shows an example of UE116, but various modifications can be made to Figure 3. For example, the various components in Figure 3 may be combined, further subdivided, or omitted, and additional components may be added depending on specific needs. As one specific example, processor 340 may be divided into multiple processors, for example, one or more central processing units (CPUs) and one or more graphics processing units (GPUs). Furthermore, although Figure 3 shows a UE116 configured like a mobile phone or smartphone, the UE may be configured to operate as other types of mobile or stationary devices.

[0050] Figures 4 and 5 show an exemplary wireless transmission and reception path according to the present invention. In the following explanation, the transmission path 400 in Figure 4 (such as BS102) will be described as being implemented on the BS, while the reception path 500 in Figure 5 (for example, UE116) will be described as being implemented on the UE. However, it will be understood that the receiving path 500 can be implemented in BS, and the transmitting path 400 can be implemented in UE. In some embodiments, the receiving path 500 is configured to support dynamic spectral sharing and scheduling for improved cross-carrier scheduling, as described in embodiments of the present invention.

[0051] The transmission path 400 shown in Figure 4 includes a channel coding and modulation block 405, a series-to-parallel (S-to-P) block 410, a size-N inverse fast Fourier transform (IFFT) block 415, a parallel-to-series (P-to-S) block 420, an add cyclic prefix block 425, and an up-converter (UC) 430. The receiving path 500 shown in Figure 5 includes a down-converter (DC) 555, a removal cyclic prefix block 560, a series-to-parallel (S-to-P) block 565, a size-N fast Fourier transform (FFT) block 570, a parallel-to-series (P-to-S) block 575, and a channel decoding and demodulation block 580.

[0052] As shown in Figure 4, the channel coding and modulation block 405 receives a set of information bits, applies coding (e.g., LDPC (low-density parity check) coding), and modulates the input bits (e.g., QPSK (quadrature phase shift keying) or QAM (quadrature amplitude modulation)) to generate a series of frequency-domain modulation symbols. The serial-parallel block 410 converts serially modulated symbols into parallel data (e.g., demultiplexes) to generate N parallel symbol streams, where N is the IFFT / FFT size used in BS102 and UE116. The IFFT block 415 of size N performs IFFT operations on N parallel symbol streams to generate a time-domain output signal.

[0053] The parallel-to-series block 420 converts parallel time-domain output symbols from the IFFT block 415 of size N to generate a series time-domain signal (e.g., multiplexed). The additional cyclic prefix block 425 inserts a cyclic prefix into the time-domain signal. The upconverter 430 modulates (e.g., upconverts) the output of the additional cyclic prefix block 425 to an RF frequency for transmission over the radio channel. The signal can also be filtered in the baseband before being converted to RF frequency. The RF signal transmitted from BS102 passes through the radio channel and then reaches UE116, where the reverse operation of the operation in BS102 takes place.

[0054] As shown in Figure 5, the downconverter 555 downconverts the received signal to the baseband frequency, and the removal cyclic prefix block 560 removes the cyclic prefix to generate a serial time-domain baseband signal. The series-parallel block 565 converts a time-domain basisband signal into a parallel time-domain signal. The FFT block 570 of size N performs the FFT algorithm to generate N parallel frequency domain signals. The parallel-series block 575 converts parallel frequency domain signals into a series of modulated data symbols. The channel decoding and demodulation block 580 demodulates and decodes the modulated symbols in order to restore the original input data stream.

[0055] Each of the BS (101-103) can implement a transmission path 400 shown in Figure 4, similar to the one used for transmission to the UE (111-116) on the downlink, and a reception path 500 shown in Figure 5, similar to the one used for reception from the UE (111-116) on the uplink. Similarly, each UE (111-116) implements a transmission path 400 for transmitting to BS (101-103) via uplink, and a reception path 500 for receiving from BS (101-103) via downlink.

[0056] Each of the components in Figures 4 and 5 can be implemented using hardware alone or a combination of hardware and software / firmware. As a specific example, at least some of the components in Figures 4 and 5 may be implemented in software, while other components may be implemented by configurable hardware or a combination of software and configurable hardware. For example, FFT block 570 and IFFT block 515 can be implemented as configurable software algorithms, where the value of size N can be modified by the implementation.

[0057] Furthermore, although the explanation described the use of FFT and IFFT, this is merely illustrative and should not be interpreted as limiting the scope of the present invention. Other types of transformations, such as the discrete Fourier transform (DFT) and inverse discrete Fourier transform (IDFT) functions, may be used. It is understood that for DFT and IDFT functions, the value of the N variable can be any integer (e.g., 1, 2, 3, 4, etc.), but for FFT and IFFT functions, the value of the N variable can be any integer that is a power of 2 (i.e., 1, 2, 4, 8, 16, etc.).

[0058] Figures 4 and 5 show examples of wireless transmission and reception paths, but various modifications can be made to Figures 4 and 5. Furthermore, the various components in Figures 4 and 5 may be combined, further subdivided, or omitted, and additional components may be added as needed. Figures 4 and 5 are diagrams illustrating examples of transmission and reception path types that may be used in wireless networks. Other suitable architectures may be used to support wireless communication in wireless networks.

[0059] Embodiments of the present invention consider enhancements to cross-carrier scheduling in order to achieve rapid, efficient, and flexible PDCCH (physical downlink control channel) monitoring. Cross-carrier scheduling is a core element of carrier aggregation (CA) operation to improve PDCCH capacity, coverage, or reliability and to simplify PDCCH monitoring by UEs. CCS (cross-carrier scheduling) includes a single scheduling cell for each serving / scheduled cell provided by the higher-level configuration.

[0060] but, (i) Dynamic use of resources available for PDCCH transmission in scheduling cells, (ii) Dynamic adaptation to the scheduled traffic provided, or (iii) In order to reduce UE power, it is advantageous to consider a scenario in which a scheduled cell can be scheduled by one or more of multiple scheduled cells. One such scenario is dynamic spectrum sharing (DSS) for a primary cell between different radio access technologies such as LTE and NR, where the primary cell can be configured for both cross-carrier scheduling and self-carrier scheduling by secondary cells (SCells) called special SCells (sSCells).

[0061] Note that PDCCH monitoring for scheduling a first number of scheduled cells from a second number of scheduled cells and for obtaining control information not associated with scheduling is performed by the corresponding UE capability for PDCCH monitoring, as described in REF3. A UE (e.g., UE116) has the capability for PDCCH monitoring defined by the maximum number of PDCCH candidates that the UE can decode and the maximum number of CCEs from which the UE can obtain different channel estimations (non-overlapping CCEs), and this capability is predetermined in the system operation specification. This capability may be defined per slot or per combination (X,Y), where Y is the number of consecutive symbols that the UE monitors for PDCCH, referred to as a span, and X is the number of symbols between the first symbols of two consecutive spans.

[0062] A UE (e.g., UE116) is configured to monitor the PDCCH using multiple sets of Common Search Spaces (CSS) and multiple sets of UE-Specific Search Spaces (USS). In addition to PDCCH monitoring for unicast traffic scheduling by USS, PDCCH monitoring for multicast-broadcast traffic scheduling by CSS may be considered under enhanced cross-carrier scheduling operations. There are also various other limitations to the legacy behavior of cross-carrier scheduling.

[0063] For example, if a scheduled cell is deactivated or its active downlink (DL) bandwidth portion (BWP) (hereinafter, (DL BWP)) is changed to dormant (DL BWP), PDCCH transmission ceases in the scheduled cell, and the scheduled cell is also effectively deactivated, changed from active (DL BWP) to dormant (DL BWP), or requires upper-layer reconfiguration for the scheduled cell to establish PDCCH monitoring for the new scheduled cell. Furthermore, the higher-level settings of the search space set on a scheduling cell and the corresponding search space set on the scheduled cell linked thereto can restrict the ability to change the activity (DL BWP) on the scheduled cell, along with the requirement that the search space set should be active (DL BWP).

[0064] Therefore, embodiments of the present invention take into consideration the need to activate multiple scheduling cells for PDCCH monitoring by CSS for multicast-broadcast traffic scheduling to scheduled cells. Embodiments of the present invention also take into account other needs to support rapid scheduling cell switching for a UE, for example, when the current scheduling cell is deactivated or changed from active (DL BWP) to dormant (DL BWP), in order to avoid RRC reconfiguration for the scheduling cell and allow the UE to continue receiving / transmitting on the scheduled cell without interruption. Embodiments of the present invention additionally consider the need to enable the UE to benefit from dynamic BWP changes for all scheduling cells and said scheduled cells without limitations on PDCCH monitoring by enabling flexible configuration and linking of search space sets on scheduling cells and search space sets on scheduled cells.

[0065] Accordingly, embodiments of the present invention describe a method and apparatus for cross-carrier scheduling that enables rapid, efficient, and flexible PDCCH monitoring in a CA framework. Embodiments of the present invention also describe a method for scheduling multicast-broadcast PDSCH reception by a CSS set on a primary cell or sSCell. In embodiments of the present invention, a mechanism for rapid replacement of scheduling cells is further described by enabling a new scheduling cell to replace a scheduling cell that has been deactivated or whose active status (DL BWP) has been changed to dormant status (DL BWP) without the need to reset the RRC of the scheduling cell. Additionally, embodiments of the present invention describe an approach for configuring a set of search spaces for scheduled cells that are linked to a set of search spaces on a plurality of corresponding scheduling cells (DL BWPs).

[0066] One motivation for enhanced cross-carrier scheduling is to reduce control signaling overhead or dynamic spectrum sharing for lower frequency bands, such as below 6 GHz (also known as FR1), in order to support the coexistence of LTE and NR radio access technologies. Generally, this embodiment applies to any CA configuration, including operation in frequency bands above 6 GHz, sidelink / V2X communication, multi-TRP / beam / panel, unlicensed / shared spectrum (NR-U), non-terrestrial networks (NTN), aerial systems such as drones and other unmanned aerial vehicles (UAVs), and private or non-public network (NPN).

[0067] Embodiments of the present invention describe multicast and broadcast service (MBS) PDSCH scheduling from two scheduling cells to scheduled cells. This will be illustrated by the following examples and embodiments, such as those shown in Figure 6 below. If a UE (e.g., UE116) is configured for scheduling on the primary cell from two scheduling cells, including the primary cell and sSCell, then PDCCH reception via a CSS set that provides a Downlink Control Information (DCI) format for scheduling unicast PDSCH (physical downlink shared channel) reception on the primary cell will only occur on the primary cell. PDCCH reception via a CSS set that provides a DCI format for scheduling "MBS PDSCH" reception on the primary cell is performed either on the primary cell or on the sSCell.

[0068] For example, the DCI format that schedules "MBS PDSCH" reception may include a CIF (carrier indicator field) with a value indicating the cell for the relevant "MBS PDSCH" reception, or "MBS PDSCH" reception may occur only on the primary cell or only on the sSCell, or the DCI format that schedules "MBS PDSCH" reception on the primary cell may associate it with a different set of index search spaces than the DCI format that schedules "MBS PDSCH" reception on the sSCell, or it may associate the CRC (cyclic redundancy check) of the DCI format with a different RNTI for scrambling.

[0069] Embodiments of the present invention describe the rapid replacement of a deactivated scheduling cell with a corresponding scheduling cell. This is illustrated in the following examples and embodiments, such as Figure 7, which are described below. A UE (for example, UE116) is configured with a set of scheduling cells for a scheduled cell. Here, since only one subset of the set of scheduling cells is active for a scheduled cell at a time, if an active scheduling cell for a scheduled cell is deactivated (or changes from active (DL BWP) to dormant BWP), the UE monitors the PDCCH for the scheduled cell on the other scheduling cells in the set of scheduling cells. For example, the UE monitors the PDCCH on the scheduling cell with the smallest index that has an active (DL BWP) BWP that is not deactivated or is not dormant, without any higher-level configuration or instructions from the gNB.

[0070] Embodiments of the present invention describe the cross-BWP configuration of the search space set for cross-carrier scheduling. This is illustrated in the following examples and embodiments, such as Figure 8, which are described below. If a UE (e.g., UE116) is configured in the first search space set on the first BWP of a scheduling cell, and also in the second search space set on the second BWP of the scheduling cell, then the UE is configured in the third search space set for the scheduled cell corresponding to the scheduling cell. In this example, the third search space set is linked to both the first and second search space sets. In one implementation example, the third search space set has the same search space set index as the first search space set, but has a different search space set index than the second search space set.

[0071] As described above, UE (e.g., UE116) is configured to monitor PDCCH using multiple CSS sets and multiple USS sets. Since a gNB (e.g., BS102) can schedule multiple UEs in a single slot, it is not practical for the gNB to configure a search space set for each UE to avoid exceeding the capacity of the corresponding UE for PDCCH monitoring. This is especially true for primary cells, where UEs are most frequently scheduled and where UEs generally receive control information, because these primary cells generally provide broad coverage and are not deactivated. For these reasons, "PDCCH overbooking" is permitted for the primary cell, the setting of the search space set may exceed the UE's capacity for PDCCH monitoring in the primary cell, and the UE must specify the priority of the search space set for PDCCH monitoring and interrupt PDCCH monitoring in lower-priority search space sets so as not to exceed the allocation of PDCCH candidates and non-overlapping CCEs to the primary cell.

[0072] If a scheduled cell has only one scheduled cell (in the case of a primary cell, the scheduled cell is a primary cell), a suitable UE procedure is defined to drop the search space set on the primary cell in order to satisfy the corresponding assignment of PDCCH candidates and non-overlapping CCEs. However, if a scheduled cell like a primary cell has multiple scheduled cells, a new UE procedure is defined.

[0073] Embodiments of the present invention take into consideration the need to define a UE procedure for search space set drop when a UE is configured in multiple scheduling cells for a scheduled cell such as a primary cell. Therefore, when a scheduled cell is configured with multiple scheduled cells, various embodiments are disclosed for handling overbooking of PDCCH monitoring for a scheduled cell, such as a primary cell. Several approaches are described for counting PDCCH candidates and non-overlapping CCEs in a slot or span, including the corresponding UE capability limits for monitored PDCCH candidates, and for prioritizing search space sets from multiple scheduling cells for PDCCH monitoring and search space set dropping.

[0074] In embodiments of the present invention, a procedure for search space set drop for a scheduled cell having a plurality of concurrent / active scheduling cells is described. For example, if a UE (e.g., UE116) is instructed to simultaneously monitor PDCCH for a serving cell on two or more scheduling cells via DCI format or other L1 / L2 signaling, or by configuration from a higher layer, the UE applies priority rules among the search space sets on two or more scheduling cells that overlap in the same slot. The search space set may include one or more CSS sets or one or more USS sets. The UE drops PDCCH monitoring for a subset of search space sets on one or more scheduling cells if the number of PDCCH candidates or non-overlapping CCEs within a slot or span does not exceed the applicable limit(a). For the sake of brevity, we will refer to such events as PDCCH overbookings.

[0075] In embodiments of the present invention, when PDCCH candidates or non-overlapping CCEs for a scheduled cell are counted individually for each scheduled cell from a plurality of scheduled cells, the procedure for search space set drop for a scheduled cell is described. This is illustrated in the following examples and embodiments, such as those shown in Figure 9. For example, UE (e.g., UE116) determines an overbooking event for a scheduled cell by individually determining an overbooking for a scheduled cell on a slot or span for any of the scheduled cells. This approach is considered, for example, when the UE counts the number of PDCCH candidates or non-overlapping CCEs for each individually scheduled cell.

[0076] In embodiments of the present invention, when counting PDCCH candidates or non-overlapping CCEs for jointly scheduled cells across all scheduling cells, a procedure for search space set drop for scheduled cells is described. This is described in the following examples and embodiments, such as those shown in Figures 10 and 11. For example, a UE (e.g., UE116) counts the number of PDCCH candidates or non-overlapping CCEs for a scheduled cell that is jointly scheduled across the scheduled cells, and determines an overbooking event for the scheduled cell if the counted number(s) exceeds a limit on the number of PDCCH candidates or non-overlapping CCEs for the scheduled cell.

[0077] In embodiments of the present invention, when the UE monitors a PDCCH on only one scheduling cell in a slot or span, the procedure for search space set drop is described. This is illustrated in the following examples and embodiments, such as Figure 12, which are described below. For example, if a UE (e.g., UE116) is instructed by a higher layer to perform PDCCH monitoring on a scheduled cell on up to one scheduled cell in any slot or span, the UE applies a procedure for dropping the search space set, as if the scheduled cell had only one scheduled cell.

[0078] In embodiments of the present invention, the procedure for each spatial set drop on a secondary cell that schedules a primary cell is described. For example, a UE (e.g., UE116) is configured by both the primary cell and sSCell, with scheduling on a cell like the primary cell. The UE is configured on the sSCell via a CSS set for, for example, a "Type-3 CSS" or a CSS used to schedule multicast-broadcast PDSCH reception on a primary cell (simply referred to as "Type-4 CSS"). The UE determines PDCCH overbooking events for an sSCell (e.g., a scheduled / serving cell) based on the CSS set and / or USS set configured on the sSCell. Therefore, UE can drop some of the search space sets in sSCell.

[0079] Throughout this specification, the terms “configuration” or “upper-layer configuration” and variations thereof (e.g., “configured”) are used to refer to one or more of the following: system information signaling, such as by master information blocks (MIBs) or system information blocks (SIBs) (e.g., SIB1); common or cell-specific upper-layer / RRC signaling; or dedicated, UE-specific, or BWP-specific upper-layer / RRC signaling.

[0080] Throughout this specification, the term signal quality is used to describe, with or without filtering such as L1 or L3 filtering of a signal or channel, such as a reference signal (RS) including a synchronization signal (SS) PBCH (physical broadcast channel) block, channel state information (CSI)-RS, or sounding reference signal (SRS), for example, reference signal received power (RSRP), reference signal received quality (RSRQ), received signal strength indicator (RSSI), signal-to-noise ratio (SNR), or signal-to-noise and interference ratio (SINR).

[0081] Throughout this specification, the term Dynamic PUSCH (Physical Uplink Shared Channel) transmission is used to refer to PUSCH transmissions scheduled in DCI format. The term Xn interface refers to the network interface between NG-RAN nodes. The F1 interface refers to the network interface between the "gNB CU" (central unit) and the "gNB DU" (distributed unit). An antenna port is defined such that the channel on which a symbol is transmitted on the antenna port can be inferred from the channels on which other symbols are transmitted on the same antenna port.

[0082] In a demodulation reference signal "(DM)-RS (DM-RS)" associated with a PDSCH, the channel on which the PDSCH symbol is transmitted on one antenna port can be inferred from the channel on which the DM-RS symbol is transmitted on the same antenna port only if the two symbols are in the same slot and the same precoding resource block group (PRG) within the same resource as the scheduled PDSCH. In the case of "DM-RS" associated with PDCCH, the channel on which the PDCCH symbol is transmitted on one antenna port is inferred from the channel on which the "DM-RS" symbol is transmitted on the same antenna port, only if the two symbols are in the same resource that the UE can assume uses the same precoding.

[0083] In DM-RS associated with PBCH, the channel on which the PBCH symbol is transmitted on one antenna port is inferred from the channel on which the DM-RS symbol is transmitted on the same antenna port only if the two symbols are in the same SS / PBCH block (SSB) transmitted within the same slot and have the same block index. Two antenna ports are considered quasi-co-located (QCL) if the large-scale attribute of a channel on which symbols are transmitted on one antenna port can be inferred from a channel on which symbols are transmitted on another antenna port. Large-scale attributes include one or more of the following: delayed diffusion, Doppler diffusion, Doppler shift, mean gain, mean delay, and spatial Rx parameters.

[0084] The UE assumes that SS / PBCH blocks transmitted at the same center frequency position and with the same block index are pseudo-collocations with respect to Doppler spread, Doppler shift, mean gain, mean delay, delay spread, and, where applicable, spatial Rx parameters. The UE may not assume pseudo-collocation for any other SS / PBCH block transmissions. If there is no "CSI-RS" setting and unless otherwise specified, the UE assumes that the "PDSCH DM-RS" and SS / PBCH blocks are pseudo-collocations for Doppler shift, Doppler diffusion, mean delay, delayed diffusion, and, where applicable, spatial Rx parameters. UE assumes that "PDSCH DM-RS" within the same CDM group is a pseudo-collocation for Doppler shift, Doppler diffusion, mean delay, delay diffusion, and spatial Rx. The UE can also assume that the "DM-RS" port associated with the PDSCH is "QCL Type A, Type D" (if applicable) and average gain and QCL. UE can also assume that "DM-RS" does not conflict with the SS / PBCH block.

[0085] In a particular embodiment, the UE (e.g., UE116) is configured with a list of up to M TCI (transmission configuration indication) state settings in the upper-layer parameter "PDSCH-Config" to decode the PDSCH with the detected PDCCH having the intended DCI for the UE and a given serving cell. Here, M depends on the UE capability "maxNumberConfiguredTCIstatesPerCC". Each "TCI-State" includes parameters for configuring QCL relationships between one or two downlink reference signals and the "DM-RS" ports of the PDSCH, the "DM-RS" ports of the PDCCH, or the "CSI-RS" ports of the "CSI-RS" resource. The pseudo-collocation relationship is established by the higher-level parameters "qcl-Type1" for the first "DL RS" and "qcl-Type2" for the second "DL RS" (if set).

[0086] In the case of two "DL RS"s, the QCL types must not be the same, regardless of whether the criteria are the same "DL RS" or different "DL RS"s. The pseudo-collocation type corresponding to each "DL RS" is provided by the higher-level parameter "qcl-Type" in "QCL-Info," which can have one of the following values. The first value, denoted as "QCL-TypeA," corresponds to {Doppler shift, Doppler spread, mean delay, delayed spread}. The second value, labeled "QCL-TypeB," corresponds to {Doppler shift, Doppler diffusion}. The third value, labeled "QCL-TypeC," corresponds to {Doppler shift, mean delay}. The fourth value, labeled "QCL-TypeD," corresponds to the {spatial Rx parameter}.

[0087] The UE receives MAC control element (MAC-CE) activation instructions to map up to N TCI states (for example, N=8 TCI states to code points in the DCI field "Transmission Configuration Indication"). When HARQ (hybrid automatic repeat request) ACK (acknowledgement) information corresponding to the PDSCH transmitting the "MAC-CE" activation command is sent to slot n, the presented mapping between the TCI state and code point in the DCI field "Transmission Configuration Indication" can be applied after the MAC-CE application time, for example, slot Starting from the first slot after TIFF0007883505000001.tif11146, here, TIFF0007883505000002.tif11146 represents the number of slots per subframe for a given subcarrier spacing (SCS) setting μ.

[0088] gNBs (such as BS102) transmit multiple SSBs within the cell bandwidth or the carrier frequency span. PCIs of SSB transmitted at different frequency positions may have different PCIs. When an SSB is associated with an SIB such as an RMSI, the SSB is referred to as a "CD-SSB" (Cell-Defining SSB). The primary cell (PCell) is associated with the CD-SSB located on the synchronization raster. From an UE perspective, each serving cell is associated with at most a single SSB. For a UE in the "RRC_CONNECTED" state (e.g., UE116), the BWP set for the UE by the serving cell may have overlapping frequencies with the BWP set for other UEs by other cells in the carrier. "CORESET#0" refers to the control resource set used for PDCCH transmission, at least for SIB1 scheduling. "CORESET#0" is configured via MIB or UE-specific RRC signaling.

[0089] Note that system information (SI) includes a MIB and multiple SIBs. The minimum SI includes the information necessary for initial access and the information needed to obtain any other SIs. The smallest SI consists of the MIB and the first SIB (SIB1). Here, the MIB contains essential physical layer information for the cell necessary to receive cell prohibition status information and additional system information (for example, the "CORESET#0" setting, which the MIB periodically broadcasts via the BCH). Furthermore, SIB1 defines the scheduling of other system information blocks and contains the information necessary for initial access. SIB1, also known as RMSI (Remaining Minimum SI), is broadcast periodically via "DL-SCH" or transmitted via "DL-SCH" to UEs in the "RRC_CONNECTED" state using a UE-specific method. Other SIBs are either broadcast periodically on "DL-SCH" or broadcast on demand on "DL-SCH" (i.e., upon request from UEs in "RRC_IDLE", "RRC_INACTIVE", or "RRC_CONNECTED"), or provided via a dedicated method on "DL-SCH" to UEs in the "RRC_CONNECTED" state (i.e., upon request from UEs in "RRC_CONNECTED" (if configured by the network or if the UE has an active BWP for which a common search space is not configured)).

[0090] For cells / frequencies considered for camping by the UE, the UE does not need to retrieve the MIB / SIB1 content for that cell / frequency from other cell / frequency layers. This does not rule out cases where the UE applies an SI stored from a previously visited cell(s). If the UE cannot determine the complete content of the cell's MIB / SIB1 by receiving data from the cell, the UE should consider the cell to be blocked. In the case of bandwidth adaptive and BWP operation, the UE acquires SI only with active BWP. The initial BWP could be, for example, 24, 48, or 96 RB in the frequency domain. MIBs are mapped to the Broadcast Control Channel (BCCH) and transmitted over the BCH, while all other SI messages are mapped to the BCCH and dynamically transmitted over the Downlink Shared Channel (DL-SCH).

[0091] For a UE to be allowed to camp in a cell, the UE must retrieve the MIB / SIB1 from that cell. The system may contain cells that do not broadcast MIB / SIB1, so the UE cannot camp in such cells. DAPS (Dual Active Protocol Stack) handover refers to a handover procedure that maintains the source gNB connection until the source cell is released, after receiving the RRC message for handover and after successful random access to the target gNB. MAC entities are defined for each cell group: one for the master cell group (MCG) and the other for the secondary cell group (SCG). When a UE is configured for a DAPS handover, two MAC entities can be considered for the UE: one for the source cell (source MAC entity) and the other for the target cell (target MAC entity).

[0092] Furthermore, CA is a framework for even wider bandwidth operation, where the UE transmits and / or receives in parallel using multiple carriers / cells called component carriers (CC). CA operation may include not only interband CC but also intraband continuous or discontinuous CC due to the frequency arrangement of CC. CA operation is observed in the PHY and MAC layers (L1 and L2), but is transparent to the upper layers. In CA, two or more CCs are aggregated. A UE can simultaneously receive or transmit with one or more CCs, depending on its capabilities.

[0093] For example, a UE with single timing advance capability for a CA can simultaneously receive and / or transmit on multiple CCs corresponding to multiple serving cells (multiple serving cells grouped into a single timing advance group (TAG)) that share the same timing advance. In another example, a UE with multiple timing advance capabilities for a CA simultaneously receives and / or transmits with multiple CCs corresponding to multiple serving cells (multiple serving cells grouped into multiple TAGs) that have different timing advances. "NG-RAN" ensures that each TAG contains at least one serving cell. In yet another example, a non-CA-enabled UE receives and transmits with a single CC corresponding to only one serving cell (one serving cell per TAG).

[0094] For CA operation, frame timing and system frame numbers (SFNs) are aligned across all aggregateable cells, or a slot multiplier offset is set for the UE between PCell / PSCell (primary secondary cell) and SCell (secondary cell). For example, the maximum number of CCs that can be set for a UE is 16 for DL ​​and 16 for UL (uplink). Along with UL / DL carrier pairs (FDD (Frequency Division Duplex) bandwidth) or bidirectional carriers (TDD (Time Division Duplex) bandwidth), the UE sets up a supplementary uplink (SUL (Supplementary Uplink)). SUL differs from aggregated uplinks in that a UE can be scheduled to transmit via one of the supplemental uplinks or the uplinks of the carrier being supplemented, but it does not transmit on both simultaneously.

[0095] Once the CA is configured, the UE will have only the network and one RRC connection. During RRC connection establishment / re-establishment / handover, one serving cell provides NAS (non-access stratum) mobility information, and during RRC connection re-establishment / handover, one serving cell provides security input. This is called a primary cell (PCell). UE capabilities configure secondary cells (SCells) to form a serving cell set together with PCells. Therefore, the serving cell set configured for the UE includes one PCell and one or more SCells. SCell reconfiguration, addition, and removal are performed by RRC. During an NR-internal handover and reconnection from "RRC_INACTIVE," the network may also add, remove, maintain, or reconfigure SCells to be used with the target PCell. When adding a new SCell, dedicated RRC signaling is used to send all the necessary system information to the SCell; that is, while in connected mode, the UE does not need to directly obtain broadcast system information from the SCell.

[0096] To enable bandwidth adaptation (BS) in PCell, the gNB (e.g., BS102) sets UL and "DL BWP" (etc.) to the UE (e.g., UE116). In the case of CA, to activate BA in SCell, gNB sets UE to a minimum (DL BWP) (i.e., it may not be UL). In the case of PCell, the BWP used for initial access is configured via system information. In the case of SCell(la), after initial activation, the BWP to be used is set via dedicated RRC signaling.

[0097] In paired spectrum, DL and UL switch BWP independently. In an unpaired spectrum, DL and UL switch BWP simultaneously. Switching between configured BWPs occurs via RRC signaling, DCI, deactivation timers, or when random access is initiated. If an inactivity timer is set for a serving cell, when the inactivity timer associated with that cell expires, the active BWP is switched to the default BWP set by the network. Unless the serving cell is set to SUL, there may be up to one active BWP per cell, in which case there may be up to one per UL carrier.

[0098] In certain embodiments, when CA is set, a cell activation / deactivation mechanism is supported to enable reasonable UE battery consumption. When SCell is deactivated, the UE does not need to receive the corresponding PDCCH or PDSCH, transmit on the corresponding uplink, or perform CQI (Channel Quality Indicator) measurements. Conversely, when the SCell is activated, the UE is expected to be able to receive PDSCH and PDCCH (if the UE is configured to monitor PDCCH from the SCell) and perform CQI measurements.

[0099] "NG-RAN" ensures that while a PUCCH (physical uplink control channel) SCell (a secondary cell configured for PUCCH) is deactivated, SCells in the secondary PUCCH group (SCell groups whose PUCCH signaling is associated with the PUCCH of "PUCCH SCell") are not activated. "NG-RAN" ensures that SCells mapped to "PUCCH SCell" are deactivated before "PUCCH SCell" is modified or removed. When a serving cell set is reconfigured, SCells added to the set are initially activated or deactivated, while SCells remaining in the set (unmodified or reconfigured) do not change their activation state (to activated or deactivated). When "RRC_INACTIVE" is used, SCell is activated or deactivated during a handover or connection reconnection.

[0100] In certain embodiments, when a BA is set, to enable reasonable UE battery consumption, only one "UL BWP" and one "DL BWP" or only one "DL / UL BWP" pair for each uplink carrier is activated at a time in the active serving cell, while all other BWPs set by the UE are deactivated. With a deactivated BWP, the UE does not monitor PDCCH and does not transmit via PUCCH, PRACH (physical random access channel), and "UL-SCH". In certain embodiments, when a CA is set, one dormant BWP is set for an SCell to enable rapid SCell activation. If the active BWP of an activated SCell is a dormant BWP, the UE will discontinue PDCCH monitoring on the SCell, but will continue CSI measurements, AGC, and beam management (if configured). DCI is used to control the entry / exit of dormant BWPs for one or more SCells or groups of SCells. A dormant BWP is one of the dedicated BWPs of a UE configured by the network via dedicated RRC signaling. SpCell and "PUCCH SCell" are not set to dormant BWP.

[0101] Cross-carrier scheduling using CIF allows a serving cell's PDCCH to schedule resources on other serving cells (e.g., for data transmission and / or reception), but current standards have the following limitations: One exemplary limitation is that cross-carrier scheduling cannot be applied to the PCell (i.e., the PCell can be scheduled via its own PDCCH). In some cases, PCell can also be cross-scheduled by SCell. In other exemplary limitations, if a SCell is set to PDCCH, the PDSCH and PUSCH of that cell are scheduled by the PDCCH on that SCell. In other exemplary limitations, if a SCell is not set to PDCCH, the PDSCH and PUSCH of that cell are scheduled by PDCCH on other serving cells. In other exemplary limitations, the scheduling PDCCH and the scheduled PDSCH / PUSCH may use the same or different numerology.

[0102] Cross-carrier scheduling allows PDCCH monitoring and / or reception in several serving cells (referred to as scheduling cells), while the received PDCCH schedules data transmission and / or reception in all serving cells (referred to as scheduled cells). PDCCH is used to schedule DL transmissions via PDSCH and UL transmissions via PUSCH. For example, DCI on PDCCH is (i) Downlink allocation including at least modulation and coding formats, resource allocation, and hybrid-ARQ information associated with DL-SCH, and (ii) Including an uplink scheduling grant that includes at least modulation and coding format, resource allocation and hybrid-ARQ information associated with UL-SCH.

[0103] In addition to scheduling, PDCCH is used for one of the following: (i) Activation and deactivation of PUSCH transmission configured in the configured grant, (ii) Activation and deactivation of PDSCH semi-sustained transmission, (iii) Notify one or more UEs of the slot format, (iv) Notify one or more UEs of PRB(et al.) and OFDM symbols(et al.) that the UE can assume are not for itself, (v) Transmission of Transmit Power Control (TPC) commands to PUCCH and PUSCH, (vi) One or more TPC instructions for SRS transmission by one or more UEs, (vii) Active bandwidth partial switching of UE, (viii) Start of random access procedure, (ix) Instruct the UE(ers) to monitor PDCCH during the next occurrence of DRX (discontinuous reception) on-duration, and / or (x) In the context of Integrated Access and Backhaul (IAB), an indication of availability for IAB-DU soft symbols.

[0104] In a particular embodiment, a UE (e.g., UE116) monitors the PDCCH candidate set in monitoring occasions consisting of one or more "COntrol REsource SETs" (CORESETs) configured by the corresponding search space configuration. CORESET is set to a PRB set with time durations of 1 to 3 OFDM symbols. Resource units (REG - resource element group) and CCEs (CCE - control channel element) are defined within a CORESET where each CCE is configured in a REG set. The control channel is formed by the aggregation of CCEs. This is implemented by aggregating different code rates for each control channel with different numbers of CCEs. Interleaved and non-interleaved CCE-REG mappings are supported in CORESET.

[0105] Note that polar coding may be used for PDCCH. Each resource element group that transmits PDCCH also transmits its own DMRS. QPSK modulation is used for PDCCH. The UE monitors the PDCCH candidate set in one or more CORESETs on the activation (DL BWP) of each activated serving cell, which is set up for PDCCH monitoring with a corresponding search space set, meaning that the monitoring decodes each PDCCH candidate by the monitored DCI format. If the UE provides "monitoringCapabilityConfig-r16" to the serving cell, the UE will: (i) If "monitoringCapabilityConfig-r16=r15monitoringcapability", then for each slot, (ii) If "monitoringCapabilityConfig-r16=r16monitoringcapability" is set, instructions are obtained to monitor the PDCCH on the serving cell for the maximum number of PDCCH candidates and non-overlapping CCEs for each span.

[0106] If the UE does not provide "monitoringCapabilityConfig-r16", the UE will monitor the PDCCH on the serving cell for each slot. The UE demonstrates the ability to monitor PDCCH with one or more combinations (X,Y)=(2,2), (4,3), and (7,3) per SCS setting for μ=0 and μ=1. The span is the number of consecutive symbols in the slot where the UE is configured to monitor the PDCCH. Each PDCCH monitoring occasion falls within a single timeframe. When the UE monitors PDCCH on a cell based on the combination (X,Y), the UE includes the entire slot. Supports PDCCH monitoring occasions on any symbol in a slot that has the minimum time separation of X symbols between the first symbols of two consecutive spans. The span starts from the first symbol where the PDCCH monitoring occasion begins and ends with the last symbol where the PDCCH monitoring occasion ends, with a maximum number of symbols in the span being Y.

[0107] If the UE demonstrates the ability to monitor PDCCH using multiple (X,Y) combinations, and the setting of the search space set for the UE for PDCCH monitoring on a cell results in the separation of each pair of consecutive PDCCH monitoring spans where the value of X for one or more of the multiple combinations (X,Y) is greater than or equal to the value of X, then the definitions in Tables 10.1-2A and 10.1-3A apply. TIFF0007883505000003.tif11146 and Based on one or more combinations (X,Y) associated with the largest maximum number in TIFF0007883505000004.tif12146, the UE monitors the PDCCH on the cell.

[0108] The UE capability for PDCCH monitoring per slot or per span on the serving cell activity (DL BWP) is defined by the maximum number of PDCCH candidates and non-overlapping CCEs that the UE can monitor per slot or per span on the serving cell activity (DL BWP), respectively. If the UE indicates a carrier aggregation capability greater than four serving cells in "UE-NR-Capability," then "UE-NR-Capability" includes an instruction for the maximum number of PDCCH candidates that the UE can monitor per slot when the UE is configured for carrier aggregation operation for more than four cells.

[0109] If the UE is not configured for "NR-DC" operation, the UE Determines the ability to monitor the maximum number of PDCCH candidates per slot corresponding to downlink cells in TIFF0007883505000005.tif12146. In this example, TIFF0007883505000006.tif12146 is the number of downlink cells configured if the UE does not provide "pdcch-BlindDetectionCA", otherwise, TIFF0007883505000007.tif12146 is the value of "pdcch-BlindDetectionCA".

[0110] If the UE indicates carrier aggregation capability greater than four serving cells in "UE-NR-Capability", and the UE does not provide "monitoringCapabilityConfig-r16" for any downlink cell, or if the UE provides "monitoringCapabilityConfig-r16=r15monitoringcapability" for all downlink cells that monitor PDCCHs, then when the UE is configured for carrier aggregation operation for more than four cells, the UE will include instructions in "UE-NR-Capability" for the maximum number of PDCCH candidates that can be monitored per slot and the maximum number of non-overlapping CCEs.

[0111] If the UE is not configured for "NR-DC" operation, the UE Determine the ability to monitor the maximum number of PDCCH candidates and the maximum number of non-overlapping CCEs per slot corresponding to the downlink cell in TIFF0007883505000008.tif12146, and in this example, TIFF0007883505000009.tif12146 is used when the UE does not provide "pdcch-BlindDetectionCA". In TIFF0007883505000010.tif12146, here, TIFF0007883505000011.tif12146 is the number of downlink cells set, otherwise, TIFF0007883505000012.tif12146 is the value of "pdcch-BlindDetectionCA".

[0112] For each "DL BWP" set for the UE in the serving cell, the UE provides the following through upper-layer signaling: if a "CORESETPoolIndex" is not provided, or if a "CORESETPoolIndex" is provided and the value of "CORESETPoolIndex" is the same for all CORESETs, P ≤ 3 CCORESET. Alternatively, the UE may provide the following through upper-layer signaling: If the "CORESETPoolIndex" provided by the upper-layer signaling is not provided for the first CORESET, or if the "CORESETPoolIndex" is provided for the first CORESET and has a value of "0", and is provided for the second CORESET and has a value of "1". P ≤ 5 CORESET.

[0113] For each CORESET, UE provides various parameters through "ControlResourceSet". One example parameter is the CORESET index P, which is defined by "controlResourceSetId". If "CORESETPoolIndex" is not provided, or if "CORESETPoolIndex" is provided and the value of "CORESETPoolIndex" is the same for all CORESETs, 0 ≤ p < 12. Alternatively, if "CORESETPoolIndex" is not provided for the first CORESET, or if "CORESETPoolIndex" is provided for the first CORESET and has a value of "0", and is provided for the second CORESET and has a value of "1", 0 <p<16である。

[0114] In other examples, the parameter includes the "DM-RS" scrambling sequence initialization value, which is "pdcch-DMRS-ScramblingID". In other examples, the parameter includes precoder granularity as a percentage of the number of REGs in the frequency domain, where the UE can assume the use of the same "DM-RS" precoder by "precoderGranularity". In other examples, the parameter includes the number of consecutive symbols provided by "duration". In other examples, the parameter includes a set of resource blocks provided by "frequencyDomainResources". In other examples, the parameters include the "CCE-REG" mapping parameters provided by "cce-REG-MappingType".

[0115] In other examples, the parameters include antenna port pseudo-collocations from a set of antenna port pseudo-collocations provided by the "TCI-State," which indicate the pseudo-collocation information for the "DM-RS" antenna port for PDCCH reception in each CORESET. Here, if the UE is provided with up to two cell lists for simultaneous TCI state activation by "concurrentTCI-UpdateList-r16" or "concurrentTCI-UpdateListSecond-r16", the UE applies the antenna port pseudo-collocations provided by "TCI-States" having the same activated "tci-StateID" value to the CORESET having index p with all configured "DL BWP" for all configured cells in the list determined from the serving cell index provided by the "MAC CE" instruction.

[0116] In further examples, the parameters include instructions to schedule PDSCH reception or SPS (semi-persistent scheduling) PDSCH deactivation via "tci-PresentInDCI" or "tci-PresentInDCI-ForDCIFormat1_2", and to indicate the presence or absence of a TCI (transmission configuration indication) field for a DCI format other than the DCI format (1_0) transmitted by the PDCCH in CORESET(p).

[0117] In a particular embodiment, if "precoderGranularity=allContiguousRBs", the UE is: (i) The CORESET resource block set is configured to include more than four subsets of resource blocks that are not continuous in frequency. (ii) Any RE in CORESET overlaps with any RE determined from "lte-CRS-ToMatchAround" or "LTE-CRS-PatternList-r16", or overlaps with any RE in an SS / PBCH block, (iii) It is not expected that both will occur.

[0118] For each CORESET in the Serving Cell's "DL BWP," each "frequencyDomainResources" provides a bitmap. For example, if CORESET is not associated with any search space set to "freqMonitorLocation-r16", the bits in the bitmap will be the starting common RB position. The file TIFF0007883505000013.tif11146 is available. TIFF0007883505000014.tif12146PRB has a "DL BWP" bandwidth and a PRB index in ascending order, with a one-to-one mapping to a non-overlapping group of 6 consecutive PRBs, where the first common RB of the first group of 6 PRBs is the common RB index if "rb-Offset-r16" is not provided. The first common RB in the first group of six PRBs has TIFF0007883505000015.tif10146, or the common RB in the first group of six PRBs is the common RB index. It has TIFF0007883505000016.tif10146, Here, TIFF0007883505000017.tif11146 is provided by "rb-Offset-r16".

[0119] In other examples, if CORESET is associated with at least one search space set set to "freqMonitorLocation-r16", then the first bitmap TIFF0007883505000018.tif9146 bits is the starting common RB position. TIFF0007883505000019.tif10146[REF4] TIFF0007883505000020.tif12146PRB has a "DL BWP" bandwidth and, in ascending order of PRB indices in each RB set k, has a one-to-one mapping to non-overlapping groups of 6 consecutive PRBs. Here, the first common RB of the first group consisting of 6 PRBs is, In TIFF0007883505000021.tif12146, k is indicated by "freqMonitoringLocations-r16" if it is not provided for the search space set, otherwise k=0.

[0120] TIFF0007883505000022.tif11146 is the number of PRBs available in RB set 0 for "DL BWP" as shown in Formula 1 below, TIFF0007883505000023.tif11146 is provided by "rb-Offset-r16", or if "rb-Offset-r16" is not provided. The filename is TIFF0007883505000024.tif10146.

number

[0121] For CORESETs other than the one with index 0, one of the following two approaches is performed. In the first approach, if the UE has not provided CORESET with the setting of TCI states(etc.) via "tci-StatesPDCCH-ToAddList" and "tci-StatesPDCCH-ToReleaseList", or if CORESET has been provided with the initial setting of more than one TCI state via "tci-StatesPDCCH-ToAddList" and "tci-StatesPDCCH-ToReleaseList", but has not received the "MAC CE" activation command for one of the TCI states listed in [REF5], the UE assumes that the "DM-RS" antenna port associated with PDCCH reception is in pseudo-collocation with the SS / PBCH block identified by the UE during the initial access procedure.

[0122] In another approach, if the UE is provided with the setting of more than one TCI state to CORESET via "tci-StatesPDCCH-ToAddList" and "tci-StatesPDCCH-ToReleaseList" as part of a reconfiguration including the synchronization procedure described in [REF6], but has not received a "MAC CE" activation command for one of the TCI states described in [REF5], the UE assumes that the "DM-RS" antenna port associated with PDCCH reception is in pseudo-collocation with a "CSI-RS" resource or SS / PBCH block identified by the UE during the random access procedure disclosed by the reconfiguration including the synchronization procedure described in [REF6].

[0123] For a CORESET with index 0, the UE assumes that the "DM-RS" antenna port for PDCCH reception within the CORESET is in pseudo-collocation with the following: (i) One or more "DL RS" set by the TCI state (where the TCI state is indicated by the "MAC CE" activation command to CORESET (if any)), or (ii) If no MAC CE activation instruction indicating a TCI state for CORESET has been received since the most recent random access procedure, the SS / PBCH blocks identified by the UE during the most recent random access procedure that was not initiated by a PDCCH instruction triggering a non-competitive random access procedure.

[0124] If a UE is provided with a single TCI state for a CORESET other than the CORESET with index 0, or if the UE receives a "MAC CE" activation command for one of the TCI states provided for the CORESET, the UE assumes that the "DM-RS" antenna port associated with PDCCH reception in the CORESET is in pseudo-collocation with one or more "DL RS" states configured by the TCI state. For a CORESET with index 0, the UE expects the SS / PBCH block to provide a "QCL-TypeD" of "CSI-RS" in the TCI state presented by the "MAC CE" activation instruction for the CORESET.

[0125] In this example, if the UE receives a "MAC CE" activation command for one of the TCI states, the UE will then activate the next first slot of the slot. The activation instruction is applied in TIFF0007883505000026.tif10131, where k is the slot to which the UE sends PUCCH along with "HARQ-ACK" information to the PDSCH providing the activation instruction, and μ is the SCS setting for PUCCH. The active BWP is defined for a slot when an activation instruction is applied. In the serving cell, for each "DL BWP" set in the UE, the UE is provided with a set of S ≤ 10 search spaces by the upper layer, where for each search space set from the S search space set, the UE provides the following parameters by "SearchSpace". The parameters may include the following:

[0126] For example, the parameter includes a search space set index s (0 < s < 40) by "searchSpaceId". In other examples, the parameter includes the relationship between the search space set s by "controlResourceSetId" and "CORESET p". In other examples, the parameter is k by "monitoringSlotPeriodicityAndOffset" s The PDCCH monitoring period of the slot and o s The PDCCH monitoring offset of the slot. In other examples, the parameter includes the PDCCH monitoring pattern within the slot, which indicates the first symbol(s) of the CORESET within the slot for PDCCH monitoring, by "monitoringSymbolsWithinSlot". In other examples, the parameter is T that indicates the number of slots in which the search space set s exists by "duration" s <ks The duration of the slot. In other examples, the parameter is the number of PDCCH candidates per CCE aggregation level L for each of CCE aggregation level 1, CCE aggregation level 2, CCE aggregation level 4, CCE aggregation level 8, and CCE aggregation level 16, by "aggregationLevel1", "aggregationLevel2", "aggregationLevel4", "aggregationLevel8", and "aggregationLevel16". TIFF0007883505000027.tif11131. In other examples, the parameter includes an indication that the search space set s is a CSS set or a USS set by searchSpaceType.

[0127] In other examples, when the search space set s is a USS set, the parameter includes one or more indications including the following. (i) Instructions using "dci-Format0-0-AndFormat1-0" to monitor PDCCH candidates for DCI format (0_0) and DCI format (1_0). (ii) Instructions via "dci-Format2-0" to monitor one or two PDCCH candidates for DCI format (2_0) and the corresponding CCE aggregation level, or to monitor one PDCCH candidate per RB set if "freqMonitorLocation-r16" is provided for the search space set by the UE. (iii) Instructions by "dci-Format2-1" to monitor PDCCH candidates for DCI format (2_1). (iv) Instructions using "dci-Format2-2" to monitor PDCCH candidates for DCI format (2_2). (v) Instructions using "dci-Format2-3" to monitor PDCCH candidates for DCI format (2_3). (vi) Instructions using "dci-Format2-4" to monitor PDCCH candidates for DCI format (2_4). (vii) Instructions using "dci-Format2-6" to monitor PDCCH candidates for DCI format (2_6).

[0128] In other examples, if the search space set s is the USS set, the parameters include instructions by "dci-Formats" to monitor PDCCH candidates for DCI format, DCI format (0_0) and DCI format (1_0), or DCI format (0_1) and DCI format (1_1), or instructions by "dci-Formats-Rel16" to monitor PDCCH candidates for DCI format (0_0) and DCI format (1_0), or DCI format (0_1) and DCI format (1_1), or DCI format (0_2) and DCI format (1_2), or, if the UE demonstrates the capability, for DCI format (0_1), DCI format (1_1), DCI format (0_2) and DCI format (1_2), or for DCI format (3_0), or DCI format (3_1), or DCI format (3_0) and DCI format (3_1).

[0129] In yet another example, the parameter includes a bitmap (if provided) by “freqMonitorLocation-r16” that indicates the indices of one or more RB sets for the search space set s, where “MSB k” of the bitmap corresponds to RB set(k-1) of “DL BWP”. For RB set k indicated by the bitmap, the first PRB of the frequency domain monitoring location limited within the RB set is Provided by TIFF0007883505000028.tif13131, here, TIFF0007883505000029.tif12131 is the index of the first common RB in RB set k [REF4], TIFF0007883505000030.tif11146 is provided by "rb-Offset-r16", or if "rb-Offset-r16" is not provided The filename is TIFF0007883505000031.tif10146.

[0130] For each RB set where the corresponding value in the bitmap is "1", the frequency domain resource allocation pattern for the monitoring location is the first of the "frequencyDomainResources" provided by the associated CORESET setting. Determined based on TIFF0007883505000032.tif9146 bits. If "monitoringSymbolsWithinSlot" instructs the UE to monitor the PDCCH with the same subset of up to three consecutive symbols in all slots where the UE monitors the PDCCH for all search space sets, the UE will not expect the "PDCCH SCS" to be set to anything other than 15kHz if the subset contains at least one symbol after the third symbol.

[0131] In certain embodiments, the UE does not expect to be provided with a first symbol and a number of consecutive symbols for a CORESET that become PDCCH candidates mapped to symbols in different slots. In certain embodiments, for the same set of search spaces or different sets of search spaces, no two PDCCH monitoring occasions for activity (DL BWP) are expected in the same CORESET, separated by a non-zero number of symbols less than the CORESET duration.

[0132] The UE determines the PDCCH monitoring occasion for activity (DL BWP) from the PDCCH monitoring cycle, PDCCH monitoring offset, and PDCCH monitoring pattern within the slot. For a set s in the search space, In the case of TIFF0007883505000033.tif11131, UE is number n f The number within the frame It is determined that a PDCCH monitoring occasion (etc.) exists in slot [REF1] with TIFF0007883505000034.tif13131. UE starts from the slot, T s Monitor PDCCH candidates for the search space set s of consecutive slots, and then the next k S -T S Do not monitor PDCCH candidates for the search space set s of consecutive slots.

[0133] For CCE aggregation levels L ∈ {1, 2, 4, 8, 16}, the USS is defined by the PDCCH candidate set for CCE aggregation level L. If the UE is set to "CrossCarrierSchedulingConfig" for a serving cell, the carrier indicator field value corresponds to the value indicated by "CrossCarrierSchedulingConfig". If the UE does not set a carrier indicator field for the serving cell activity (DL BWP) that the UE monitors for PDCCH candidates in the USS, the UE will monitor the PDCCH candidates without a carrier indicator field. If the UE has set a carrier indicator field for the serving cell activity (DL BWP) that the UE monitors for PDCCH candidates in the USS, the UE will monitor PDCCH candidates that have the carrier indicator field.

[0134] In a particular embodiment, if the UE is configured to monitor PDCCH candidates in the carrier indicator field corresponding to the relevant secondary cell of another serving cell, the UE does not expect to monitor PDCCH candidates in the activity (DL BWP) of the secondary cell. For serving cell activity (DL BWP) that the UE monitors for PDCCH candidates, the UE monitors PDCCH candidates for at least the same serving cell. For the search space set s associated with "CORESET p", the slot for the serving cell activity (DL BWP) corresponding to the carrier indicator field value n CI For the search space set candidate at TIFF0007883505000035.tif13131 The CCE index for the aggregation level L corresponding to TIFF0007883505000036.tif9131 is described in Equation 2 shown below.

Number

[0135] In Equation (2), for any CSS It is TIFF0007883505000038.tif11131 Also, in Equation (2), for the USS It is TIFF0007883505000039.tif14131, Y p,-1 = n RNTI ≠ 0, for pmod3 = 0, Ap = 39827, for pmod3 = 1, Ap = 39829, for pmod3 = 2, Ap = 39839 and D = 65537 Also, in Equation (2), i = 0, ···, L - 1 The expression N in Equation (2) CCE,p Is the number of CCEs numbered from 0 to N CCE,p - 1 per RB set (if any) in "CORESET p" The expression n in Equation (2) CI Is the carrier indicator field value if the UE sets it in the carrier indicator field by "CrossCarrierSchedulingConfig" for the serving cell where the PDCCH is monitored, and otherwise, n CI ​​​​​​​ TIFF0007883505000041.tif12131 is the number of PDCCH candidates configured to monitor for the aggregation level L of the search space set s for the serving cell corresponding to n CI For any CSS, note that it is TIFF0007883505000042.tif13130. In the case of USS, TIFF0007883505000043.tif12130 is the maximum value of TIFF0007883505000044.tif12131 for all n values set for the CCE aggregation level L of the search space set s. CI For the RNTI value used for n in Equation (2), it is "C-RNTI" (cell-RNTI).

[0137] RNTI The UE is expected to monitor PDCCH candidates for up to 4 sizes of DCI formats including up to 3 sizes of DCI formats CRC scrambled by "C-RNTI" per serving cell. The UE counts the number of sizes for the DCI format per serving cell based on the number of PDCCH candidates configured in each search space set for the corresponding active (DL BWP).

[0138] For the serving cell n CI The PDCCH candidate with index j TIFF0007883505000045.tif13130 for the search space set S using the CCE set in "CORESET p" for the active (DL BWP) has index i <S j for the search space set S If a PDCCH candidate with TIFF0007883505000046.tif13130 ​​exists, it is either not counted for monitoring or is a serving cell n using the same CCE set. CI In the activity against (DL BWP), within "CORESET p", the index ( has TIFF0007883505000047.tif13130) (TIFF0007883505000048.tif12130) If a PDCCH candidate exists, the PDCCH candidate has the same scrambling, and the corresponding DCI format for the PDCCH candidate has the same size; otherwise, the index PDCCH candidates with the ID TIFF0007883505000049.tif13130 ​​will be counted as targets for monitoring.

[0139] Table 10.1-2 of [REF3] (reproduced below and referred to as Table 1) shows the maximum number of PDCCH candidates monitored per slot for the UE in a "DL BWP" with an SCS setting μ for operation with a single serving cell. Provide TIFF0007883505000050.tif12130. In particular, Table 1 shows the maximum number of PDCCH candidates monitored per slot in "DL BWP" with SCS settings μ∈{0,1,2,3} for a single serving cell. The file TIFF0007883505000051.tif12130 is listed. [Table 1]

[0140] Table 10.1-2A of [REF3] (reproduced below and referred to as Table 2) shows the maximum number of PDCCH candidates monitored per span for a UE in a "DL BWP" with an SCS setting μ for operation with a single serving cell. Provide TIFF0007883505000053.tif11130. In particular, Table 2 shows the maximum number of PDCCH candidates monitored over a span for a combination (X,Y) in a "DL BWP" with an SCS setting μ∈{0,1} for a single serving cell. The file TIFF0007883505000054.tif11130 is listed. [Table 2]

[0141] Table 10.1-3 of [REF3] (reproduced below and referred to as Table 3) shows the maximum number of non-overlapping CCEs in a "DL BWP" with an SCS setting μ expected to monitor the corresponding PDCCH candidate per slot for the UE to operate with a single serving cell. Provide TIFF0007883505000056.tif10131. Here, CCE for PDCCH candidates are (i) When they correspond to different CORESET indexes, or (ii) Non-overlapping occurs when each PDCCH candidate corresponds to a different first symbol for reception. In particular, Table 3 shows the maximum number of non-overlapping CCEs per slot in "DL BWP" with SCS setting μ∈{0,1,2,3} for a single serving cell. The file TIFF0007883505000057.tif10131 is listed. [Table 3]

[0142] Table 10.1-3A of [REF3] (reproduced below and referred to as Table 4) shows the maximum number of non-overlapping CCEs in a "DL BWP" with an SCS setting μ expected to monitor the corresponding PDCCH candidate per span for the UE to operate with a single serving cell. Provide TIFF0007883505000059.tif12131. In particular, Table 4 shows the maximum number of non - overlapping CCEs in the span for the combination (X,Y) in the "DL BWP" with SCS setting μ ∈ {0,1} for a single serving cell TIFF0007883505000060.tif12131 is described

Table 4

[0143] The UE has a "DL BWP" with SCS setting μ TIFF0007883505000062.tif13131 when set to a downlink cell (where TIFF0007883505000063.tif17131), the UE, in the active (DL BWP) of the scheduling cell, does not need to monitor more non - overlapping CCEs per slot for each scheduled cell than TIFF0007883505000064.tif12131 or more PDCCH candidates than TIFF0007883505000065.tif10131

[0144] The UE has a "DL BWP" with SCS setting μ TIFF0007883505000066.tif13131 when set to a downlink cell (where TIFF0007883505000067.tif17131), and the "DL BWP" of the activated cell is the active (DL BWP) of the activated cell, and the "DL BWP" of the deactivated cell is the "DL BWP" with the index provided by "firstActiveDownlinkBWP - Id" for the deactivated cell, the UE does not need to monitor more than the PDCCH candidates (described in Equation (3)) or (described in Equation (4)) TIFF0007883505000068.tif13131 There is no need to monitor more than non-overlapping CCEs per slot in the activity (DL BWP) (etc.) of the scheduling cell (etc.) from the downlink cell.

number

number

[0145] For each scheduled cell, the UE has an activity (DL BWP) per slot with the SCS setting μ of the scheduled cell. More non-overlap CCEs than TIFF0007883505000071.tif13130 ​​or There is no need to monitor more PDCCH candidates than TIFF0007883505000072.tif13130. If the UE does not report "pdcch-BlindDetectionCA" or does not provide "BDFactorR", then γ=R. Similarly, if the UE reports "pdcch-BlindDetectionCA", the UE is instructed by "BDFactorR" to be γ=1 or γ=R.

[0146] In certain embodiments, a UE (e.g., UE116) is monitored with the activity (DL BWP) of the scheduling cell(s) along with the associated PDCCH candidate using the SCS setting μ. TIFF0007883505000073.tif11133 If set to a downlink cell (here TIFF0007883505000074.tif12133), UE does not need to monitor at least one of the following for scheduling cell activity (DL BWP):

[0147] In other words, the UE is a scheduling cell TIFF0007883505000075.tif12133 If it's from a downlink cell, per slot for each scheduled cell More non-overlap CCEs than TIFF0007883505000076.tif11128 or There is no need to monitor more PDCCH candidates than TIFF0007883505000077.tif10128 using scheduling cell activity (DL BWP).

[0148] Furthermore, UE's scheduling cell is TIFF0007883505000078.tif12133 If it's from a downlink cell, per slot for each scheduled cell More non-overlap CCEs than TIFF0007883505000079.tif12133 or There is no need to monitor more PDCCH candidates than TIFF0007883505000080.tif12133 using scheduling cell activity (DL BWP).

[0149] Furthermore, UE's scheduling cell is For TIFF0007883505000081.tif12133 from a downlink cell, per slot for CORESET has the same "CORESETPoolIndex" value for each scheduled cell. More non-overlap CCEs than TIFF0007883505000082.tif11129 or There is no need to monitor more PDCCH candidates than TIFF0007883505000083.tif13129 using scheduling cell activity (DL BWP).

[0150] (i) The UE did not provide "monitoringCapabilityConfig-r16" or "monitoringCapabilityConfig-r16=r15monitoringcapability" If UE is set in TIFF0007883505000084.tif12129 Downlink Cell, (ii) When the UE is set to the associated PDCCH candidate that is monitored by the activity (DL BWP) of the scheduling cell (la) using the SCS setting μ (where TIFF0007883505000085.tif14129), and (iii) If the "DL BWP" of an activated cell is the activation (DL BWP) of the activated cell and the "DL BWP" of an inactivated cell is the "DL BWP" with an index provided by the "firstActiveDownlinkBWP-Id" for the inactivated cell, then the UE is greater than the PDCCH candidates shown in formula (5) below or the PDCCH candidates shown in formula (6) below TIFF0007883505000086.tif12129 There is no need to monitor the activity (DL BWP) (rar) of scheduling cells (rar) from downlink cells (rar) if it is greater than the non-overlapping CCE per slot.

number

number

[0151] In a particular embodiment, for each scheduled cell, the UE is: TIFF0007883505000089.tif12133 Activity (DL BWP) per slot with SCS setting μ from downlink cell to scheduling cell More non-overlap CCEs than TIFF0007883505000090.tif13130 ​​or There is no need to monitor more PDCCH candidates than TIFF0007883505000091.tif13130.

[0152] In a particular embodiment, for each scheduled cell, the UE is: TIFF0007883505000092.tif12133 Activity (DL BWP) per slot with SCS setting μ from downlink cell to scheduling cell More non-overlap CCEs than TIFF0007883505000093.tif12146 or There is no need to monitor more PDCCH candidates than TIFF0007883505000094.tif12146.

[0153] In a particular embodiment, for each scheduled cell, the UE is: TIFF0007883505000095.tif12133 Per slot for CORESETs with the same "CORESETPoolIndex" value for activation (DL BWP) with SCS setting μ of downlink cell to scheduling cell More non-overlap CCEs than TIFF0007883505000096.tif12146 or There is no need to monitor more PDCCH candidates than TIFF0007883505000097.tif11146.

[0154] UE provided "monitoringCapabilityConfig-r16=r16monitoringcapability" TIFF0007883505000098.tif11146 downlink cell, associated PDCCH candidate monitored with the activity (DL BWP) of scheduling cell(s) using SCS setting μ, and combination (X,Y) for PDCCH monitoring TIFF0007883505000099.tif11146 Downlink Cell TIFF0007883505000100.tif11146(here If the UE is set only in TIFF0007883505000101.tif12146), and the "DL BWP" of the activated cell is the activation (DL BWP) of the activated cell, and the "DL BWP" of the deactivated cell is the "DL BWP" with the index provided by "firstActiveDownlinkBWP-Id" for the deactivated cell, then the UE is, More PDCCH candidates than TIFF0007883505000102.tif12146 (here, TIFF0007883505000103.tif12146 is described in formula (7) below) or More non-overlapping CCEs than TIFF0007883505000104.tif12146 (where, TIFF0007883505000105.tif12146 does not require monitoring of the expression (8) described in formula (8).

[0155] TIFF0007883505000106.tif11146 The result of the union of PDCCH monitoring occasions for all scheduling cells from the downlink cell is a combination (X,Y) PDCCH monitoring, if any pair of spans in the set is within the Y symbol (where the first X symbol starts with the first symbol that has a PDCCH monitoring occasion, and the next X symbol starts with the first symbol that has a PDCCH monitoring occasion not included in the first X symbol), TIFF0007883505000107.tif11146 From downlink cell to all scheduling cells (rar) activity (DL BWP) (rar) per spanset TIFF0007883505000108.tif11146 From downlink cell to all scheduling cells (rar) activity (DL BWP) (rar) per spanset There is no need to monitor more non-overlapping CCEs than TIFF0007883505000109.tif12146.

[0156] Similarly, UE is TIFF0007883505000110.tif11146 From downlink cell to all scheduling cell activity (DL BWP) (and) per span set (maximum 1 span per scheduling cell for each span set, otherwise, TIFF0007883505000111.tif11146 is the number of cells set in SCS setting j. There is no need to monitor more non-overlapping CCEs than TIFF0007883505000112.tif12146.

[0157] If the UE has "monitoringCapabilityConfig-r16=r15monitoringcapability" and "monitoringCapabilityConfig-r16=r16monitoringcapability" set in all of the provided downlink cells, TIFF0007883505000113.tif11146 is This will be replaced with TIFF0007883505000114.tif11146.

number

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[0158] In a particular embodiment, for each scheduled cell, the UE uses the combination (X,Y) From TIFF0007883505000117.tif11146 downlink cell, with activity (DL BWP) having SCS setting μ of scheduling cell, per span More non-overlap CCEs than TIFF0007883505000118.tif12146 or There is no need to monitor more PDCCH candidates than TIFF0007883505000119.tif12146.

[0159] In certain embodiments, the UE (e.g., UE116) does not expect to be configured with a set of CSS consisting of the total number of PDCCH candidates and non-overlapping CCEs monitored per slot or span, or the number per scheduled cell, that exceeds the corresponding maximum number per slot or span. For the same cell scheduling or cross-carrier scheduling, the UE (e.g., UE116) does not expect the number of PDCCH candidates and the corresponding number of non-overlapping CCEs per slot or span of secondary cells to be greater than the corresponding number that the UE can monitor per slot or span of secondary cells, respectively. If the UE provides "PDCCHMonitoringCapabilityConfig=r16monitoringcapability" for the primary cell, except for the first span of each slot, the UE does not expect the number of PDCCH candidates and the corresponding number of non-overlapping CCEs per span of the primary cell to be greater than the corresponding number that the UE can monitor in the primary cell per span.

[0160] In the case of cross-carrier scheduling, the number of PDCCH candidates for monitoring and the number of non-overlapping CCEs per span or per slot are counted individually for each scheduled cell. For all search space sets within slot n or within the span of slot n, I CSS A set of CSS with cardinality S CSS Displayed as J USS A set of USS with cardinality S USS Display it as follows. S USS USS set position S j (0≦j <J USS ) is in ascending order of the search space set index. CSS Set S CSS(i) The number of PDCCH candidates counted for monitoring TIFF0007883505000120.tif11146(0≦i CSS ) is displayed as USS set S CSS The number of PDCCH candidates counted for monitoring (j) TIFF0007883505000121.tif11146(0≦j <J USS Displayed as ). For CSS sets, UE uses slots or spans to total Requesting a non-overlap CCE for TIFF0007883505000122.tif13146 Monitor the TIFF0007883505000123.tif14146PDCCH candidate.

[0161] The UE assigns a PDCCH candidate for monitoring to a USS set for a primary cell that has activity (DL BWP) with SCS setting μ in the first span of each slot if "PDCCHMonitoringCapabilityConfig" is not provided for the primary cell by the following pseudocode, or if "PDCCHMonitoringCapabilityConfig=r15monitoringcapability" is provided for the primary cell, or if "PDCCHMonitoringCapabilityConfig=r16monitoringcapability" is provided for the primary cell.

[0162] ​For USS sets for scheduling on a primary cell, if the UE is provided with a "CORESETPoolIndex" for the first CORESET, or a "CORESETPoolIndex" with a value of "0" for the first CORESET, and a "CORESETPoolIndex" with a value of "1" for the second CORESET, and if the formula (9) shown below or the formula 10 shown below is satisfied, then the following pseudocode (shown in syntax (1) shown below) applies only to the USS set associated with the first CORESET. The UE does not expect to monitor the PDCCH in the USS set without a PDCCH candidate assigned for monitoring.

[0163] In the following pseudocode, if the UE is provided with "PDCCHMonitoringCapabilityConfig=r16monitoringcapability" for the primary cell, TIFF0007883505000124.tif13129 and TIFF0007883505000125.tif11129 TIFF0007883505000126.tif10146 and Replace each with TIFF0007883505000127.tif12146, TIFF0007883505000128.tif10146 and TIFF0007883505000129.tif11146 TIFF0007883505000130.tif12146 and Replace each one with TIFF0007883505000131.tif12146.

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[0164] In the syntax (1) shown below, the search space set S USS V is the set of non-overlapping CCEs for (j). CCE (S USS (j)) is displayed, and the search space set S USS For (j), the non-overlapping CCE is assigned for monitoring the CSS set, along with the PDCCH candidate and the entire search space set S. USS V is determined considering the PDCCH candidates assigned for monitoring for (k)(0≦k≦j). CCE (S USS (j)) Cardinality is C(V CCE (S USS Display using (j). TIFF0007883505000134.tif112146

[0165] UE, (i) Set to single-cell operation or operation with carrier aggregation in the same frequency band, (ii) When monitoring PDCCH candidates in overlapping PDCCH monitoring occasions with multiple CORESETs having the same or different "QCL-TypeD" attributes in the activity (DL BWP) of one or more cells, the UE will monitor the PDCCH only in the CORESET. In this example, the UE monitors PDCCH by the activity of one cell out of one or more cells (DL BWP) only in any other CORESET from among multiple CORESETs that have the same "QCL-TypeD" attribute as the CORESET.

[0166] Here, CORESET corresponds to the CSS set with the lowest index in the cell with the lowest index containing CSS (if any), otherwise it corresponds to the USS set with the lowest index in the cell with the lowest index. The lowest USS set index is determined for all USS sets that have at least one PDCCH candidate in overlapping PDCCH monitoring occasions. To determine the CORESET, the SS / PBCH block is assumed to have the "CSI-RS" and other "QCL-TypeD" attributes. To determine the CORESET, it is assumed that the first "CSI-RS" associated with the SS / PBCH block of the first cell and the second "CSI-RS" of the second cell associated with the SS / PBCH block have the same "QCL-TypeD" attribute. The assignment of non-overlapping CCEs and PDCCH candidates for PDCCH monitoring is based on all search space sets associated with multiple CORESETs for the activity (DL BWP)(et al.) of one or more cells. The number of active TCI states is determined by multiple CORESETs.

[0167] In a particular embodiment, the UE is (i) Set to single-cell operation or operation with carrier aggregation in the same frequency band, (ii) When monitoring PDCCH candidates in overlapping PDCCH monitoring occasions across multiple CORESETs where none of the CORESETs have a TCI-state with "QCL-TypeD", the UE must monitor PDCCH candidates in overlapping PDCCH monitoring occasions across search space sets associated with different CORESETs.

[0168] It should be noted that embodiments of the present invention consider various scenarios in which the UE may be configured to monitor PDCCH for serving cells on two or more scheduling cells. A serving cell can be a primary cell or a secondary cell (SCell), such as a PCell, PSCell, or SpCell. Two or more scheduling cells include a primary cell or a secondary cell. Scheduling operation or PDCCH monitoring indicates self-scheduling or cross-carrier scheduling. In one example, a serving cell may be a primary cell, and the two corresponding scheduling cells include a primary cell for self-carrier scheduling and a secondary cell (SCell) for cross-carrier scheduling of the primary cell, such a SCell is referred to as a scheduling / special SCell or "sSCell".

[0169] In another example, the serving cell is SCell 1, and the two corresponding scheduling cells are: (i) Primary cell for cross-carrier scheduling and first SCell for self-carrier scheduling of the first SCell, (ii) A first SCell for self-carrier scheduling and a second SCell different from the first SCell for cross-carrier scheduling of the first SCell, (iii) The primary cell for cross-carrier scheduling of the first SCell and all of the second SCells that are different from the first SCell, or (iv) All of the second and third SCells, which are different from the first SCell, for cross-carrier scheduling of the first SCell.

[0170] In yet another example, a UE (e.g., UE116) can monitor PDCCHs on multiple scheduling cells in the same or different monitoring occasions (MOs). For example, the UE is configured to monitor PDCCH on two scheduling cells, with overlapping MOs, where the first and second scheduling cells are for the same serving / scheduled cell. In another example, the UE is set to a first set of "PDCCH MO" on the first scheduling cell and a second set of "PDCCH MO" on the second scheduling cell. Here, the first and second sets of "PDCCH MO" do not overlap in time, as if they were in different slots or in different slot spans. In yet another example, the UE is configured in two scheduling cells, where any slot or span contains a "PDCCH MO" on up to one scheduling cell based on network instructions such as DCI format or MAC-CE instructions.

[0171] Although CA is considered in the present invention, the embodiments can be identically applied to scenarios having multiple transmit and receive points (multiplex-TRP) in one or more serving / scheduled / scheduled cells, where the same and / or different spatial settings / relationships / beams are additionally used. Embodiments of the present invention describe a MBS (Multi-Block System) for a scheduled cell where there are two (simultaneous) scheduled cells. This will be illustrated by the following examples and embodiments, as shown in Figure 6.

[0172] Figure 6 is a flowchart illustrating an exemplary method 600 for scheduling unicast PDSCH reception and "MBS PDSCH" reception from two scheduling cells on a scheduled cell according to an embodiment of the present invention. The steps of method 600 in Figure 6 are performed by any of the UEs (111-116) in Figure 1 (for example, UE116 in Figure 3). Method 600 is for illustrative purposes only, and other embodiments may be used without departing from the scope of the present invention.

[0173] In a particular embodiment, the UE (e.g., UE116) is configured for multiple scheduling cells relative to a scheduled cell. For example, a scheduled cell is a primary cell and has both a primary cell and sSCell as scheduling cells. The UE is also configured to monitor the PDCCH by a set of CSSs for scheduling PDSCH reception, such as those associated with multicast or broadcast traffic. For the sake of brevity, the following explanation will use the term MBS. DCI formats that schedule "MBS PDSCH" are distinguished from DCI formats that schedule unicast PDSCH by being based on the corresponding indicator field within each DCI format, on different sizes for each DCI format, or on different RNTIs for scrambling CRC in each DCI format.

[0174] For example, a DCI format for scheduling unicast PDSCH reception has a CRC scrambled by "C-RNTI", while a DCI format for scheduling "MBS PDSCH" reception has a CRC scrambled by "Group-RNTI" (G-RNTI). When the UE is configured for a multiplexed MBS traffic type, the UE provides each multiplexed "G-RNTI," or the DCI format indicates the traffic type. In the first implementation example, the UE (e.g., UE116) is configured with a first search space set on multiple scheduling cells for monitoring PDCCHs that provide a DCI format for scheduling unicast PDSCHs on scheduled cells, and a second search space set on a single scheduling cell only for monitoring PDCCHs that provide a DCI format for scheduling "MBS PDSCHs" on scheduled cells, where, for example, the single scheduling cell and the scheduled cell are primary cells or SCells. The reason for the restriction on the second search space set is to maintain common behavior for both unicast PDSCH and "MBS PDSCH," where scheduling of PDSCH reception using the CSS set is performed only from a single scheduling cell to a single scheduled cell (e.g., the primary cell).

[0175] In the second implementation example, the UE (e.g., UE116) is configured to be a set of search spaces on multiple scheduling cells, such as a primary cell or sSCell, for monitoring a PDCCH that provides a DCI format for scheduling a unicast PDSCH or "MBS PDSCH" on a scheduled cell such as a primary cell or sSCell. The only set of search spaces associated with unicast PDSCH receive scheduling on sSCell is the USS set. The only set of search spaces associated with the "MBS PDSCH" receive scheduling is the CSS set. In the first approach, "MBS PDSCH" reception is performed only on scheduled cells, and the DCI format used to schedule "MBS PDSCH" reception does not include the carrier indicator field.

[0176] In the second approach, "MBS PDSCH" reception is performed on an additionally scheduled cell, and the DCI format for scheduling "MBS PDSCH" reception includes a CIF to indicate the scheduled cell. The DCI format provided by the PDCCH reception via the CSS set that schedules the unicast PDSCH reception does not include CIF, and the unicast PDSCH reception only occurs on the same scheduled cell as the scheduling cell (e.g., only on the primary cell). In the third approach, MBS PDSCH receptions are associated with different scheduled cells, where different G-RNTI or different DCI format sizes are scheduled from the same scheduling cell.

[0177] Additionally, in any implementation example, the first coreset associated with the search space set for the DCI format that schedules "MBS PDSCH" reception may differ from the second coreset associated with the search space set for the DCI format that schedules unicast PDSCH reception. For example, the TRP associated with receiving an "MBS PDSCH" may differ from the TRP associated with receiving a unicast PDSCH, so the TCI state for receiving a PDCCH in the first coreset may differ from the TCI state for receiving a PDCCH in the second coreset. A similar method can be used for the DCI format to activate SPSPDSCH for MBS traffic, or for the higher-layer configuration of SPSPDSCH for MBS traffic.

[0178] Method 600, shown in Figure 6, illustrates an exemplary procedure for scheduling unicast PDSCH reception and "MBS PDSCH" reception from two scheduling cells on a scheduled cell according to the present invention. In step 610, the UE (e.g., UE116) is configured with two scheduling cells for the scheduled cell. For example, scheduling cells are primary cells and sSCells, and the scheduled cell is the primary cell. In step 620, the UE receives the PDCCH via the CSS set, where the PDCCH provides the DCI format for scheduling PDSCH reception. In step 630, the UE determines whether the PDSCH is an "MBS PDSCH". If the PDSCH is a unicast PDSCH and not an "MBS PDSCH" (determined in step 630), the scheduling cell is the primary cell, the scheduled cell is the primary cell, and the DCI format does not include CIF (step 640). If PDSCH is "MBS PDSCH" (determined in step 630), the scheduling cell is the primary cell or any scheduling cell such as sSCell; if the DCI format includes CIF, the scheduled cell is the primary cell or any cell such as sSCell; otherwise, the scheduled cell is the scheduling cell (step 650).

[0179] Figure 6 shows method 600, but various modifications can be made to Figure 6. For example, although method 600 is shown in the figure as a series of steps, various steps may overlap, occur in parallel, occur in other orders, or occur multiple times. In other examples, steps may be omitted or replaced by other steps. For example, the steps of method 600 may be performed in a different order.

[0180] Embodiments of the present invention also describe the rapid replacement of deactivated scheduling cells with corresponding scheduled cells(s). This will be illustrated by the following examples and embodiments shown in Figure 7. Figure 7 is a flowchart illustrating an exemplary method 700 for switching from a first scheduled cell to a second scheduled cell for a scheduled cell according to an embodiment of the present invention. The steps of method 700 in Figure 7 are performed by any of the UEs (111-116) in Figure 1 (for example, UE116 in Figure 3). Method 700 is for illustrative purposes only, and other embodiments may be used without departing from the scope of the present invention.

[0181] In a particular embodiment, the UE (e.g., UE116) is configured to be a set of scheduling cells for a scheduled cell. Here, since only one subset of the scheduling cell set is activated at a time, if an active scheduling cell for a scheduled cell is deactivated or its active (DL BWP) is changed to a dormant BWP, the UE monitors the PDCCH for the scheduled cells on other scheduling cells in the scheduling cell set, for example, on the scheduling cell with the smallest index that has not been deactivated or on the scheduling cell that has a non-dormant BWP as its active (DL BWP), without upper-level resetting by the serving gNB or any such instruction. Such a procedure is advantageous for the smooth scheduling of scheduled cells while a scheduling cell is deactivated or changed from active (DL BWP) to dormant (DL BWP).

[0182] In one implementation example, UE (e.g., UE116) is configured as a scheduled cell having a first scheduling cell as the first priority scheduling cell and a second scheduling cell as the second priority scheduling cell. For example, priority may be explicitly indicated by a separate field in the scheduling cell settings, or implicitly determined by the scheduling cell's index, where, for instance, scheduling cells with smaller indices have lower priority. For example, UE expects to perform PDCCH monitoring on cells scheduled on the first scheduling cell if the first scheduling cell is activated and has active (DL BWP) status, not dormant (DL BWP). If the first scheduling cell is deactivated, or if the UE changes the status of the first scheduling cell from active (DL BWP) to dormant (DL BWP), the UE expects the scheduled cell to be scheduled by the second scheduling cell, and vice versa, without any further instructions from the network. The UE may also have activated scheduling cells, such as primary cells.

[0183] A change in scheduling cell from the first scheduling cell to the second scheduling cell (and vice versa) is applied after a predetermined time, depending on the state of the second scheduling cell. If the second scheduling cell is activated and has an active (DL BWP) state for the UE that is not dormant (DL BWP), then the time is the time required for the UE to determine whether the first scheduling cell is deactivated or to change from active (DL BWP) to dormant BWP. If the second scheduling cell is activated and has an active (DL BWP) state that is dormant (DL BWP) for the UE, the time additionally includes a BWP switching delay. If the second scheduling cell is deactivated, the time may additionally include the time required for time-frequency tracking, AGC settling, CSI reporting, and the application time of MAC control element (CE) instructions (if activation is performed by "MAC CE").

[0184] For example, if the UE receives a "MAC CE" instruction for deactivating the first scheduling cell in the PDSCH in slot n, or indicates a change from active (DL BWP) to dormant (DL BWP) for the first scheduling cell in slot n, (i) DCI format (2_6), (ii) DCI format (0_1), or (iii) When a DCI format such as DCI format (1_1) is received, the UE begins monitoring the PDCCH for the scheduled cell on the second scheduling cell in the first slot.

[0185] In the first example, the first slot is, These are slots starting from TIFF0007883505000135.tif11146, where μ is the SCS setting for the cell that received the PDSCH from which the UE transmits the MAC-CE instruction. In the second example, the first slot is the slot after the BWP switching time duration following slot n, as defined in REF8. In the third example, the first slot is for PDSCH / PUSCH preparation T from slot n onwards. proc,1 or T proc,2 This is a slot with the same duration as the previous one. In the fourth example, the first slot is the symbols from the last symbol to N symbols later in the PDCCH in slot n, which indicates dormancy for the first scheduling cell, where N is based on the UE capability for PDCCH processing, for example, N=5 if μ=0, N=5.5 if μ=1, N=11 if μ=2, and otherwise N=10 if μ=0, N=12 if μ=1, N=22 if μ=2, and N=25 if μ=3, where μ corresponds to the SCS setting for PDCCH. In yet another example, the first slot is a combination of the time durations described above.

[0186] In one implementation example, when a SCell is deactivated by the "MAC CE" instruction, the UE either receives a "MAC CE" instruction in the PDSCH in slot n to deactivate the first scheduling cell, or indicates sleep (DL BWP) for the first scheduling cell in slot n. (i) DCI format (2_6), (ii) DCI format (0_1), or (iii) From a slot that has received a DCI format such as format (1_1) to a slot where the UE begins monitoring the PDCCH for the scheduled cell on the second scheduling cell for a predetermined time duration.

[0187] In one example, the UE does not expect to receive a PDCCH for the scheduled cell on the first or second scheduling cell. In another example, the UE continues to receive PDCCH for the scheduled cell on the first scheduling cell. Subsequently, the UE continues to receive PDCCH on the third scheduling cell for the scheduled cell, such as the primary cell. The UE monitors the PDCCH on a new scheduling cell, such as a second scheduling cell, for scheduling transmission or reception on the scheduled cell or for other instructions corresponding to the scheduled cell, after a predetermined time. In another example, if the first scheduling cell is activated for a scheduled cell, or if its activity (DL BWP) changes from dormant (DL BWP) to non-dormant (DL BWP), the UE expects to be scheduled for the cell scheduled by the first scheduling cell and monitors the PDCCH on the first scheduling cell after a predetermined time. Alternatively, the UE can be continuously scheduled to cells that have been scheduled by the second scheduling cell.

[0188] In other implementations, a serving cell is configured with a first scheduling cell and a second scheduling cell, where the first or second scheduling cell is a scheduling cell for a cell scheduled by time occasion, and the UE is instructed to change between the first and second scheduling cells as scheduling cells for a scheduled cell, which is possible even when both the first and second scheduling cells are activated and each has non-dormant activity (DL BWP). For example, the instructions are given in DCI format. For example, the instruction applies to a group of scheduled cells. For example, the UE may be instructed to monitor PDCCH for scheduled cells on the first scheduling cell if the first scheduling cell is not overloaded for PDCCH transmission, and otherwise, the UE may be instructed to monitor PDCCH for scheduled cells on the second scheduling cell. Additionally, changes to scheduling cells due to deactivation or changes from non-dormant to dormant status for active (DL BWP) cells may be applied. Such a mechanism enables dynamic load balancing of PDCCH loads between scheduling cells.

[0189] In one example, if the scheduled cell for the UE is the primary cell and the scheduling cell has the primary cell and the first sSCell, the UE additionally sets up a second sSCell for cross-carrier scheduling on the primary cell. If the first sSCell is deactivated or its activity (DL BWP) is changed to a dormant BWP for the UE, the UE begins monitoring the PDCCH on the second sSCell for primary cell cross-carrier scheduling. In one example, when the first sSCell is deactivated or its active (DL BWP) is changed to a dormant BWP, and the second sSCell is either a deactivated SCell or has a dormant BWP as its active (DL BWP), the UE is configured to activate the second sSCell (if applicable) or change its active BWP to a non-dormant BWP. In this case, after a predetermined time, the UE begins monitoring the PDCCH on the second sSCell for primary cell cross-carrier scheduling.

[0190] In one example, if the UE monitors the PDCCH on the second sSCell for scheduling on the primary cell, and the UE determines that the first sSCell is activated or has changed from an active (DL BWP) to a non-dormant BWP, the UE returns to the first sSCell to monitor the PDCCH for scheduling on the primary cell and stops monitoring the PDCCH on the second sSCell. Alternatively, the UE may continue monitoring the PDCCH on the second sSCell for scheduling on the primary cell until it receives instructions from the serving gNB, including by timer expiration whenever possible, or until the second sSCell is deactivated or its active (DL BWP) is changed to a dormant BWP. The UE then returns to the first sSCell to monitor the PDCCH for scheduling on the primary cell. The same principle applies even when the scheduled cell is not the primary cell.

[0191] The method 700 shown in Figure 7 is a flowchart illustrating an exemplary procedure for switching from a first scheduling cell to a second scheduling cell for a scheduled cell according to the present invention. In step 710, the UE (e.g., UE116) is configured in a scheduled cell having a first-priority scheduling cell and a second-priority scheduling cell. In step 720, the UE monitors the PDCCH for the scheduled cells on the first priority scheduling cell. In step 730, the UE receives an instruction to either deactivate the first-priority scheduling cell or switch the active BWP to a dormant BWP for the first-priority scheduling cell. For example, such instructions are given in DCI format or by the "MAC-CE" instruction. In step 740, the UE begins monitoring the PDCCH for the scheduled cells on the second-priority scheduling cell. PDCCH monitoring on the second priority scheduling cell is performed after a predetermined time.

[0192] Figure 7 shows method 700, but various modifications can be made to Figure 7. For example, although method 700 is shown in the figure as a series of steps, various steps may overlap, occur in parallel, occur in other orders, or occur multiple times. In other examples, steps may be omitted or replaced by other steps. For example, the steps of method 700 may be performed in a different order.

[0193] Embodiments of the present invention further describe the cross-BWP configuration of the search space set for cross-carrier scheduling. This will be illustrated by the following examples and embodiments shown in Figure 8. Figure 8 is a flowchart illustrating an exemplary method 800 for cross-BWP configuration of linked search space sets for cross-carrier scheduling according to an embodiment of the present invention. The steps of method 800 in Figure 8 are performed by any of the UEs (111-116) in Figure 1 (for example, UE116 in Figure 3). Method 800 is for illustrative purposes only, and other embodiments may be used without departing from the scope of the present invention.

[0194] In a particular embodiment, the UE is configured with a first search space set on a scheduled cell linked to a second search space set configured at the second BWP of the scheduling cell, where the first and second search space sets have different indices, and the second BWP is different from the first BWP of the scheduling cell, where the UE is configured with a third search space set having the same indices as the first search space set. In one modified example, the UE can be set with a first search space set on a scheduled cell that is linked to all of the second and third search space sets on the scheduling cell, where, (i) The second set of search spaces is: (a) Set to the second BWP of the scheduling cell, (b) Having different indices from each other compared to the indices of the first search space set, (ii) The third search space set is: (a) Set to the first BWP of the scheduling cell, (b) Having the same index as the first search space set, (iii) The first BWP and the second BWP are different from each other. It should be noted that this mechanism enables flexible PDCCH monitoring on scheduled cells without any restrictions on dynamic BWP switching on scheduled cells and on all scheduled cells.

[0195] For example, if the active BWP for a scheduling cell changes from the first BWP to the second BWP, the UE continuously monitors the PDCCH for the scheduled cells on the first search space set. Such PDCCH monitoring may not be possible if there is no link between the first and second search space sets. The UE uses the exploration space set for PDCCH monitoring for scheduled cells only if all "DL BWPs" configured with the scheduling cell and the exploration space set linked to the scheduled cell are active. The search space set index is unique to each BWP of the serving cell. Additionally, the CORESET associated with the search space set is set to the same BWP as the search space set.

[0196] The syntax (2) shown below illustrates an exemplary RRC configuration for cross-BWP links between a multiple search space set on a scheduling cell and a search space set on a scheduled cell. TIFF0007883505000136.tif156148

[0197] The method 800 shown in Figure 8 illustrates an exemplary procedure for cross-BWP configuration of linked search space sets for cross-carrier scheduling according to the present invention. In step 810, the UE (e.g., UE116) receives the settings for cross-carrier scheduling of the scheduled cells from the scheduling cell. In step 820, the UE receives a setting for the link between the second search space set on the second (DL BWP) of the scheduling cell and the first search space set of the scheduled cell, where the first and second search space sets have different indices. In step 830, the UE receives a setting for the link between the third search space set on the first (DL BWP) of the scheduling cell and the first search space set of the scheduled cell, where the first search space set has the same index as the third search space set. In step 840, if the scheduling cell's activity (DL BWP) is 1 (DL BWP), the UE monitors the first search space set of the scheduled cell on the scheduling cell's third search space set. If the scheduling cell's activation (DL BWP) is changed to the second (DL BWP) in step 850, the UE monitors the scheduling cell's first search space set on the scheduling cell's second search space set.

[0198] Figure 8 shows method 800, but various modifications can be made to Figure 8. For example, although method 800 is shown in the figure as a series of steps, various steps may overlap, occur in parallel, occur in other orders, or occur multiple times. In other examples, steps may be omitted or replaced by other steps. For example, the steps of method 800 may be performed in a different order.

[0199] Embodiments of the present invention also describe a UE procedure for search space set drop for a scheduled cell having multiple scheduled cells in a slot or span. In a particular embodiment, if the UE is configured / instructed to monitor PDCCH for serving cells on multiple scheduling cells in the same slot or span, the UE applies priority rules for PDCCH monitoring for the search space set on the multiple scheduling cells. A search space set includes one or more Common Search Space (CSS) sets or one or more UE-Specific Search Space (USS) sets. If the number of PDCCH candidates or non-overlapping CCEs being monitored in a slot exceeds the applicable limit(rar), the UE drops the search space set on one or more scheduling cells among the multiple scheduling cells(rar) based on the priority designation rules. For the sake of brevity, we will refer to such events as PDCCH overbooking.

[0200] To determine PDCCH overbooking events in a slot or span for a scheduled cell, the UE counts the number of PDCCH candidates and non-overlapping CCEs that the UE monitors in the slot or span for the scheduled cell. In the first approach, the UE counts the number of PDCCH candidates or non-overlapping CCEs individually for each scheduled cell. In the second approach, the UE jointly counts the number of PDCCH candidates or non-overlapping CCEs across all scheduled cells for a given cell. The overbooking procedure will be explained in detail below, based on each approach.

[0201] Embodiments of the present invention also describe a UE procedure for search space set drop for scheduled cells when counting the number of PDCCH candidates or non-overlapping CCEs for cells individually scheduled for each scheduling cell from multiple scheduling cells. This will be illustrated by the following examples and embodiments shown in Figure 9. Figure 9 is a flowchart illustrating an exemplary method 900 for PDCCH overbooking and drop when monitored PDCCH candidates and non-overlapping CCEs for scheduled cells are counted individually from each scheduled cell according to an embodiment of the present invention. The steps of method 900 in Figure 9 are performed by any of the UEs (111-116) in Figure 1 (for example, UE116 in Figure 3). Method 900 is for illustrative purposes only, and other embodiments may be used without departing from the scope of the present invention.

[0202] In a particular embodiment, the UE (e.g., UE116) individually determines overbooking events for scheduled cells on a slot or span for any scheduled cell. This approach is applicable, for example, when the UE counts the number of PDCCH candidates or non-overlapping CCEs for each of the individually scheduled cells. In one example, the UE counts the number of PDCCH candidates or non-overlapping CCEs in each slot or span on a scheduling cell for cells scheduled by an SCS setting for PDCCH transmission on the scheduling cell, and compares this number to the corresponding limit for PDCCH candidates or non-overlapping CCEs for scheduled cells on the scheduling cell for the SCS setting.

[0203] The UE can determine overbooking events for scheduled cells, either by scheduling slots or spans for each scheduled cell. For example, the UE determines an overbooking event for a scheduled cell if the number of PDCCH candidates or non-overlapping CCEs in the first slot of the first scheduling cell for a scheduled cell exceeds a limit on the number of PDCCH candidates or non-overlapping CCEs for PDCCH reception with a first SCS setting on the first scheduling cell. Alternatively, the UE determines an overbooking event for a scheduled cell if the number of PDCCH candidates or non-overlapping CCEs in the second slot of the second scheduling cell for a scheduled cell exceeds a limit on the number of PDCCH candidates or non-overlapping CCEs for PDCCH reception with a second SCS setting on the second scheduling cell.

[0204] If a UE (e.g., UE116) determines an overbooking event for a scheduled cell on the first or second scheduling cell, the UE separately applies priority rules between search space sets for PDCCH monitoring on the relevant first or second scheduling cell. The UE first assigns PDCCH candidates or non-overlapping CCEs to the CSS set (if any) for the scheduled cells on the relevant first or second scheduling cell, and then assigns the remaining PDCCH candidates or non-overlapping CCEs to the first USS set in ascending / descending order of the USS set index. If the UE is smallest or does not have enough index in one of the second USS sets to monitor all PDCCH candidates, PDCCH monitoring for the second USS set with a larger index is dropped. For example, if the UE is set up as a primary cell with all self-carrier scheduling and cross-carrier scheduling from sSCell, the UE performs overbooking decisions and potential search space set drops (e.g., USS set drops) separately on the primary cell and on sSCell.

[0205] The UE also determines limits on the number of PDCCH candidates or non-overlapping CCEs in a slot or span for each scheduling cell. For example, the limit values ​​correspond to the first SCS setting μ1 for the first scheduling cell and the second SCS setting μ2 for the second scheduling cell. TIFF0007883505000137.tif12148 or This is a predetermined limit on the number of PDCCH candidates, such as TIFF0007883505000138.tif14148, and similar content applies to a predetermined limit on the number of non-overlapping CCEs. In other examples, the limit value TIFF0007883505000139.tif11147 or This could be a scaled version of a given limit on the number of PDCCH candidates, such as TIFF0007883505000140.tif12147 (where the parameters 0≦α≦1 and 0≦β≦1 may be provided by the upper layer), and similar matters apply to a given limit on the number of non-overlapping CCEs.

[0206] In other examples, the limit is a scaled version of a given limit for the number of PDCCH candidates, where the scaling is TIFF0007883505000141.tif12147 or This applies only to the components of the limit value, such as TIFF0007883505000142.tif12147, and similar matters apply to a given limit value for the number of non-overlapping CCEs. In other examples, the limit value TIFF0007883505000143.tif13147(where μ * A predetermined maximum / total limit value for the number of BDs or non-overlapping CCEs corresponding to the minimum (or maximum) SCS / numerology among the scheduling cells for a given cell, such as =min{μ1,μ2}). In yet another example, the limit value Other variations of scaled maximum / total limits are possible, such as TIFF0007883505000144.tif12147.

[0207] In certain embodiments, SS set drop also applies to CSS sets. For example, as discussed above, the assignment scaling parameters for PDCCH candidates and non-overlapping CCEs are set to 0≦α≦1 and 0≦β≦1, thereby preventing the UE from monitoring all PDCCH candidates or non-overlapping CCEs for all sets of CSS in the slots / spans on the first or second scheduling cell of the scheduled cell. In this case, UE applies SS set drop to the CSS set. For example, UE assigns PDCCH candidates or non-overlapping CCEs in a slot / span in ascending order of CSS set indices, starting with CSS index i=0. If any remaining PDCCH candidates or non-overlapping CCEs are smaller than the PDCCH candidates or non-overlapping CCEs for CSS set i, they are assigned to CSS sets with lower indices, which are then dropped from the CSS set with index i. In this case, UE drops PDCCH monitoring for all CSS sets and USS sets in slots / spans that have an index greater than or equal to i.

[0208] Method 900, shown in Figure 9, describes an exemplary procedure for PDCCH overbooking and drop when monitored PDCCH candidates and non-overlapping CCEs for a scheduled cell are counted individually on each scheduled cell. In step 910, the UE (e.g., UE116) is configured with two scheduling cells for the scheduled cell. In step 920, the UE individually determines limits on the number of PDCCH candidates and non-overlapping CCEs for slot / span-by-span PDCCH monitoring for scheduled cells on each of the two scheduling cells. For example, such individual assignments are based on the corresponding scaling parameters 0≦α≦1 or 0≦β≦1 as described above. In step 930, the UE individually counts the number of PDCCH candidates and non-overlapping CCEs monitored in slots / spans for the scheduled cells on each of the two scheduling cells. In step 940, the UE determines a PDCCH overbooking event if the number of PDCCH candidates or non-overlapping CCEs counted in slots / spans for scheduled cells on the scheduling cell exceeds the limit for the corresponding PDCCH candidates or non-overlapping CCEs. In response to a PDCCH overbooking event, the UE drops a USS set with a higher index for PDCCH monitoring associated with the scheduled cell on the scheduling cell in step 950.

[0209] Figure 9 shows method 900, but various modifications can be made to Figure 9. For example, although method 900 is shown in the figure as a series of steps, various steps may overlap, occur in parallel, occur in other orders, or occur multiple times. In other examples, steps may be omitted or replaced by other steps. For example, the steps of method 900 may be performed in a different order.

[0210] Embodiments of the present invention also describe a UE procedure for search space set drop for scheduled cells when counting PDCCH candidates or non-overlapping CCEs for jointly scheduled cells across all scheduling cells. This will be illustrated by the following examples and embodiments, as shown in Figures 10 and 11. Figure 10 is a flowchart illustrating exemplary method 1000 for PDCCH overbooking and drop for a primary cell scheduled by both the primary cell and sSCell according to an embodiment of the present invention. Figure 11 is a flowchart illustrating an exemplary method 1100 for PDCCH overbooking and dropping of the search space set when monitored PDCCH candidates and non-overlapping CCEs for a scheduled cell are jointly counted across two scheduled cells according to an embodiment of the present invention. The steps of method 1000 in Figure 10 and method 1100 in Figure 11 are performed by any of the UEs (111-116) in Figure 1 (for example, UE116 in Figure 3). Methods 1000 and 1100 are for illustrative purposes only, and other embodiments may be used without departing from the scope of the present invention.

[0211] In the second approach, the UE (e.g., UE116) counts the number of PDCCH candidates or non-overlapping CCEs for a cell jointly scheduled across multiple scheduling cells for a scheduled cell, and determines an overbooking event for the scheduled cell if the counted number exceeds the applicable limit for the number of PDCCH candidates or non-overlapping CCEs. If the UE is configured to monitor PDCCH across multiple scheduled cells with the same SCS setting on the corresponding activation (DL BWP) for a scheduled cell, the UE counts the number of PDCCH candidates or non-overlapping CCEs for the scheduled cell in a slot / span across all scheduled cells and compares the counted number to the corresponding maximum / total limit for the SCS setting.

[0212] If a UE is configured to monitor PDCCHs on two scheduled cells with different SCS settings for the relevant activation (DL BWP) for a scheduled cell, the UE counts the number of PDCCH candidates or non-overlapping CCEs to be monitored for the scheduled cell based on the slot / span determined by one of the following options: In one option (displayed as Option 1), the UE counts the number of monitored PDCCH candidates or non-overlapping CCEs for scheduled cells by the slot / span corresponding to the scheduling cell with a smaller SCS setting. In the other option (displayed as Option 2), the UE counts the number of monitored PDCCH candidates or non-overlapping CCEs for scheduled cells by the slots / spans corresponding to scheduling cells with larger SCS settings. In the other option (displayed as Option 3), the UE counts the number of monitored PDCCH candidates or non-overlapping CCEs for a scheduled cell by slots / spans corresponding to SCS settings for a reference cell, e.g., a scheduled cell, or a scheduled cell with a higher priority level, such as a primary cell, or priority based on ascending / descending order of cell index. In addition, in another option (indicated as Option 4), the UE counts the number of monitored PDCCH candidates or non-overlapping CCEs for a scheduled cell by a reference slot / span corresponding to a reference SCS setting provided by the upper layer or predetermined in the system operating specification, such as an SCS setting of 15kHz for FR1 and 120kHz for FR2.

[0213] In one example, under the first option (explained above), if the multiple slots / spans of the second scheduling cell with the second SCS setting overlap with the slots / spans of the first scheduling cell with the first SCS setting (i.e., the second SCS setting is greater than the first SCS setting), the UE counts all PDCCH candidates on the second scheduling cell with multiple slots / spans, along with the number of PDCCH candidates on the first scheduling cell in the slots / spans. A similar example is applied to count the number of non-overlapping CCEs. If a PDCCH candidate or non-overlapping CCE on the first or second scheduling cell(s) has an SCS setting greater than the reference cell, as in the third option, or greater than the reference SCS / numerology, as in the fourth option, then a similar example(s) applies to any of the third or fourth options.

[0214] In one example, in the case of the second option (as explained above), the first slot / span of the first scheduling cell having the first SCS setting partially overlaps with the second slot / span of the second scheduling cell having the second SCS setting, where the first SCS setting is smaller than the second SCS setting. In the first implementation example, the UE counts the PDCCH candidates on the first scheduling cell against the number of PDCCH candidates monitored for the cell scheduled in the second slot / span, with the corresponding limits being for the second SCS setting and the second slot / span. In the second implementation example, the UE counts the number of PDCCH candidates on the second scheduling cell against the number of PDCCH candidates monitored for the cells scheduled in the first slot / span, and the corresponding limit values ​​are the first SCS settings and the limit values ​​for the first slot / span. A similar example is applied to calculate the number of non-overlapping CCEs for scheduled cells. If a PDCCH candidate or non-overlapping CCE on the first or second scheduling cell (etc.) has an SCS setting smaller than the reference cell, as in the third option, or larger than the reference SCS / numerology, as in the fourth option, then a similar example (etc.) applies to any of the third or fourth options.

[0215] For example, if two scheduling cells have two different SCS settings μ1 and μ2 for their respective activity levels (DL BWP), then BD1 and BD2 are the number of PDCCH candidates monitored in the first and second scheduling cells, respectively, and CCE1 and CCE2 are the number of non-overlapping CCEs monitored in the first and second scheduling cells, respectively. In a first example of counting the allocation of PDCCH candidates / non-overlapping CCEs to slot-specific or span-specific search space sets, the UE counts PDCCH candidates / non-overlapping CCEs based on the SCS setting of the activity (DL BWP) of the relevant scheduling cell. For example, the UE counts BD1 and CCE1 per slot / span based on the SCS setting μ1, and BD2 and CCE2 per slot / span based on the SCS setting μ2.

[0216] In the second example, the UE counts BD1 and CCE1, as well as BD2 and CCE2, per slot / span based on a reference setting such as the minimum or maximum SCS setting of the scheduling cell, or based on a default SCS setting determined, for example, by the system operating specification for each frequency range or set by a higher layer. For example, if μ1 = 15 kHz and μ2 = 30 kHz, the UE first counts BD1 and CCE1 per slot / span based on the SCS setting μ1 = 15 kHz, then counts BD2 and CCE2 per two slots / spans using the SCS setting μ1 = 30 kHz (the ratio between the SCS of the second scheduling cell and the SCS of the first scheduling cell is 2), and the UE compares the counted PDCCH candidates and non-overlapping CCEs to the corresponding limit values ​​for the SCS setting μ1 = 15 kHz.

[0217] Based on Tables 10.1-2 and 10.1-3 of [REF3], the UE capability for the total number of PDCCH candidates or non-overlapping CCEs for PDCCH monitoring for two slots with SCS setting μ2 = 30 kHz is greater than the corresponding UE capability for PDCCH monitoring for one slot with SCS setting μ1 = 15 kHz. Therefore, to apply the PDCCH overbooking procedure, limits are determined on the number of PDCCH candidates and non-overlapping CCEs for cells scheduled based on scheduling cells with smaller SCS settings, thereby ensuring that the UE will have PDCCH monitoring capability with the search space set resulting from the PDCCH overbooking procedure.

[0218] In various examples, the UE operation for jointly counting multiple PDCCH candidates across two scheduling cells of a scheduled cell is as follows: (i) Show a simple addition or linear combination of a first number of PDCCH candidates on the first scheduling cell and a second number of PDCCH candidates on the second scheduling cell, or (ii) A weighted combination of a first number of PDCCH candidates on the first scheduling cell and a second number of PDCCH candidates on the second scheduling cell is shown, where the UE determines the weighting parameters based on subsequently considered scaling parameters 0 ≤ α ≤ 1 and 0 ≤ β ≤ 1 for the limit on the number of PDCCH candidates or non-overlapping CCEs in a slot or span for the scheduled cell.

[0219] The UE determines a limit on the number of PDCCH candidates or non-overlapping CCEs in a slot or span for cells jointly scheduled across multiple scheduled cells for a scheduled cell. In the first example, the limit may be a predefined maximum / total limit on the number of PDCCH candidates based on the minimum or maximum SCS setting of the scheduling cell, for example. The filename is TIFF0007883505000145.tif12148. For example, for two scheduling cells having corresponding first and second SCS settings μ1 ≤ μ2, the UE determines the maximum / total limit on the number of PDCCH candidates per slot based on the corresponding maximum / total limit per slot for the SCS setting μ1. The UE applies the same approach to determine the maximum / total limit on the number of non-overlapping CCEs.

[0220] In the second example, the limit may be a scaled version of a predetermined maximum / total limit for the number of PDCCH candidates, for example, In TIFF0007883505000146.tif13147, the scaling parameters 0≦α≦1 and 0≦β≦1 are provided by the higher layer or predetermined by the system operation specification. The UE applies the same approach to determine the maximum / total limit on the number of non-overlapping CCEs.

[0221] In the third example, the limit may be another scaled version of a predetermined maximum / total limit for the number of PDCCH candidates, where scaling is performed with respect to scaling parameters γ≧0 and ρ≧0. TIFF0007883505000147.tif14142 or This applies only to some or all components of the limit, such as TIFF0007883505000148.tif12142. The UE applies the same approach to determine the maximum / total limit on the number of non-overlapping CCEs.

[0222] The UE (e.g., UE116) determines a PDCCH overbooking event for a scheduled cell in a slot or span if the number of PDCCH candidates or non-overlapping CCEs counted in a slot / span by the search space set exceeds a corresponding limit in the slot or span that the UE jointly calculates across multiple scheduling cells. In this case, the UE applies priority rules to the search space set for scheduled cells on all multiple scheduling cells, and if an overbooking event occurs, the UE drops the search space set. Prioritization of search space sets on a multiple scheduling cell for a scheduled cell may be determined based on one or more of the following: priority order between search space set types such as CSS sets and USS sets, priority order between multiple scheduling cells, and priority order between search space sets of the same type on the same scheduling cell.

[0223] For example, UE gives higher priority to the CSS set than to the USS set. In other examples, UE is, (i) Cell indexes such as primary cells that have a higher priority than SCell, such as sSCell, (ii) SCS settings for scheduling cell activation (DL BWP) such as scheduling cells with a smaller (or larger) SCS setting having a higher priority than scheduling cells with a larger (or smaller) SCS setting (iii) Priority levels between scheduling cells provided by the higher-level settings, (iv) Based on those combinations, the first scheduling cell is given a higher priority than the second scheduling cell. In yet another example, within the same type of search set on the same scheduling cell, the UE gives higher priority to the search space set with a smaller index.

[0224] Note that additional criteria may exist for determining the priority order between search space sets in a slot or span, such as the number of PDCCH candidates in the search space set, the maximum CCE aggregation level for PDCCH candidates corresponding to the search space set, the DCI format type / size for the search space set, or TCI states for a CORESET associated with a search set, such as prioritizing search space sets associated with a CORESET that have the same TCI state when more than one UE cannot receive them simultaneously. For example, a search set with a larger total number of PDCCH candidates has a higher priority than a search space set with a smaller total number of PDCCH candidates.

[0225] For example, a first set of search spaces with non-zero PDCCH candidates having a larger maximum CCE aggregation level, such as "16 CCE", has a higher priority than a set of search spaces with non-zero PDCCH candidates having a smaller maximum CCE aggregation level, such as "4 CCE". In other examples, a search space set associated with a CORESET set to "CSI-RS" as the TCI state has a higher (or lower) priority than a search space set associated with a CORESET set to SSB as the TCI state. In further examples, search space sets associated with a CORESET having a lower CORESET index and / or set to a BWP having a lower BWP index have a higher priority.

[0226] In one implementation example, if the UE considers only one or more of the three main elements described above for specifying the search space set priority, it will use one or more of the additional criteria described above to determine the priority order between search space sets if they have the same priority. For example, the selection or criteria for the above elements, or combinations thereof, are predetermined in the specifications for system operation. In further examples, the higher-level settings provide indications as to whether any of the above elements, criteria, or combinations thereof can be used to determine the SS set priority level. As an additional example, the SS set priority level can be set by the higher tier.

[0227] In the first approach, the UE applies priority rules in three steps. In the first example, the UE first applies priority order by the search space set type, then by the scheduling cell order index, and finally by the search space set index. In other examples, the UE first applies a priority order by the search space set type, then by the search space set index, and finally according to the scheduling cell index order. In the third example, the UE first applies a priority order according to the scheduling cell index order, then by the search space set type, and finally by the search space set index. Additionally, UE can assign PDCCH candidates and non-overlapping CCEs to CSS sets, assuming that priority specification for CSS sets is not necessary.

[0228] Subsequently, the UE assigns priority to USS sets by USS set index, and if USS sets have the same index, assigns priority by scheduling cell index, where the priority assignment by scheduling cell index is defined in the system operation specification or provided by a higher layer to prioritize the USS set on the scheduling cell with the smallest (or largest) index. Alternatively, for USS sets, the UE can prioritize them by scheduling cell index based on one of the previous approaches, and then prioritize those same scheduling cell indexes by ascending order of USS set indexes.

[0229] In other examples, the UE combines some or all of the three elements considered above and applies a priority rule in one or two steps. For example, the UE first applies a priority order based on the search space set type, and then follows a combined priority order that includes all scheduling cell priorities and search space set indices. For example, such a combined priority order can be set by upper-level signaling or determined from a specification formula such as "combined priority level = scheduling cell priority + search space set index" or "combined priority level = scheduling cell priority * search space set index". Priority rules / orders are predetermined by the system operation specifications or set by higher layers.

[0230] The UE can expect that the total number of PDCCH candidates and the total number of non-overlapping CCEs from the CSS set on all scheduled cells for cells scheduled with the aforementioned SCS configuration in slots / spans will not exceed the corresponding limits for the scheduled cells. Subsequently, the UE assigns the remaining PDCCH candidates or non-overlapping CCEs for the scheduled cell to the USS set on the scheduled cell for the scheduled cell, and if necessary, the UE applies the search space set drop procedure to the USS set as described above. For example, if the scheduled cell is the primary cell and the corresponding scheduled cell is the primary cell and sSCell, then the PDCCH candidate / non-overlapping CCE can be assigned to the CSS set on the PCell and sSCell without CSS set drop, and the search space set drop is applied to the USS set on the primary cell or sSCell. The decision on which USS sets to drop is based on the priority between search space sets, taking into account, for example, the scheduling cell index and the search space set index as described above.

[0231] Method 1000, shown in Figure 10, illustrates an exemplary procedure for PDCCH overbooking and drop for a primary cell scheduled by both the primary cell and sSCell. In step 1010, the UE (e.g., UE116) is configured to monitor PDCCH for scheduling to the primary cell in both the primary cell and sSCell. In step 1020, the UE determines a limit on the number of PDCCH candidates and non-overlapping CCEs in the slot / span relative to the primary cell, based on the minimum SCS between the primary cell and sSCell. In step 1030, the UE assigns PDCCH candidates and non-overlapping CCEs in slots / spans relative to the primary cell for the CSS set on the primary cell and sSCell. In step 1040, the UE determines the number of remaining PDCCH candidates and non-overlapping CCEs in slots / spans up to the applicable limit in order to assign them to the USS set for the primary cell in the primary cell and sSCell. In step 1050, the UE determines a PDCCH overbooking event if the number of PDCCH candidates or non-overlapping CCEs in slots / spans for a primary cell across the entire USS set on the primary cell or sSCell exceeds the determined remaining number. In response to an overbooking event, the UE drops the USS set in the primary cell or sSCell with the lower priority in step 1060, according to the priority assignment rules. For example, the priority rules between the primary cell and the sSCell USS set can be based on the scheduling cell priority and the search space set index, as described above.

[0232] In another example, PDCCH overbooking applies to both the CSS set and the USS set. Prioritization rules can be applied between multiple CSS sets of scheduled cells for a scheduled cell, and if there is a PDCCH overbooking event, the CSS set(s) with lower priority may be dropped. For example, if the scheduled cell is the primary cell and the corresponding scheduled cell is the primary cell and sSCell, the UE will drop the CSS set on sSCell when an overbooking event occurs. The decision of which CSS set or USS set to drop is based, for example, on the priority between search space sets, taking into account the scheduling cell index and search space set index as described above. In another example, UE drops a set of CSS on the primary cell.

[0233] In other implementation examples, the UE (e.g., UE116) assigns PDCCH candidates and non-overlapping CCEs between multiple scheduling cells for cells scheduled based on priority assignments between multiple scheduling cells, for example, using the method described above. For example, UE first assigns PDCCH candidates and non-overlapping CCEs to the CSS set, then assigns them to the USS set on the scheduling cell with higher priority, and continues in ascending order of scheduling cell priority. In one example, the UE anticipates that the number of PDCCH candidates or non-overlapping CCEs corresponding to the CSS set of the scheduling cell with the highest priority for the scheduled cell will not exceed the limit for PDCCH candidates or non-overlapping CCEs for the scheduled cell. Subsequently, the UE will not drop the CCS set on the scheduling cell with the highest priority, but will drop the USS set on the scheduling cell with the highest priority, or drop the CSS set or USS set on scheduling cells with a lower priority than the highest priority. For example, if the scheduled cell for a UE is a primary cell and the corresponding scheduled cell is a primary cell and an sSCell, the UE first assigns PDCCH candidates and non-overlapping CCEs to the CSS set on the primary cell. Subsequently, if a PDCCH overbooking event occurs, the UE drops the USS set on the primary cell or the CSS set or USS set on the sSCell. The decision of which CSS or USS sets to drop is based on the priority among the search space sets, as described above.

[0234] In other implementations, the UE (e.g., UE116) assigns PDCCH candidates and non-overlapping CCEs between multiple scheduling cells for scheduled cells by alternately assigning them to sets of search spaces on multiple serving cells. For example, if there are two scheduling cells for a scheduled cell, the UE assigns the PDCCH candidate and non-overlapping CCE to the CSS set, then assigns the PDCCH candidate and non-overlapping CCE to the USS set with the smallest index on the first (or second) scheduling cell, then assigns the PDCCH candidate and non-overlapping CCE to the USS set with the smallest index on the second (or first) scheduling cell, then assigns the PDCCH candidate and non-overlapping CCE to the USS set with the next smallest index on the first (or second) scheduling cell, and so on. For example, a search space set with a higher priority is a CSS set with a lower index in a cell with a lower index that contains a CSS set (if any), and if not, a USS set with a lower index that has at least one PDCCH candidate where the PDCCH monitoring occasions / slots / spans overlap.

[0235] Method 1100, shown in Figure 11, illustrates an exemplary procedure for PDCCH overbooking and dropping of the search space set when monitored PDCCH candidates and non-overlapping CCEs for a scheduled cell are jointly counted across two scheduled cells. In step 1110, the UE (e.g., UE116) is configured with two scheduling cells for the scheduled cell. In step 1120, the UE determines PDCCH candidates and limits for non-overlapping CCEs for each scheduled cell per slot / span based on the minimum SCS setting within the scheduling cell. In step 1130, the UE counts the number of monitored PDCCH candidates and non-overlapping CCEs for cells jointly scheduled by the minimum SCS in slots / spans across two scheduling cells. In step 1140, the UE determines a PDCCH overbooking event if the number of PDCCH candidates or non-overlapping CCEs for scheduled cells counted across two scheduling cells exceeds the applicable limit. In response to an overbooking event, the UE, according to the priority rules, drops the CSS set or USS set with the lower priority among the search space sets on the two scheduling cells in step 1150.

[0236] Furthermore, it may be possible for the UE to determine whether or not there is an overbooking event after assigning PDCCH candidates and non-overlapping CCEs to one or both of the scheduling cells, rather than anticipating that an overbooking event will occur in one or both of the scheduling cells. For example, the priority setting rule can be based on at least one of the priorities between two scheduling cells, or it can be based on the ascending order of the search space set index while considering the scheduling cells, such as prioritizing the search space set on the scheduling cell with the largest or smallest index as described above.

[0237] Figure 10 shows method 1000 and Figure 11 shows method 1100, but various modifications can be made to Figures 10 and 11. For example, although methods 1000 and 1100 are shown as a series of steps, various steps may overlap, occur in parallel, occur in other orders, or occur multiple times. In other examples, steps may be omitted or replaced by other steps. For example, the steps of method 1000 and method 1100 may be performed in any other order.

[0238] Embodiments of the present invention also describe a UE procedure for search space set drop when the UE monitors PDCCH for only one scheduling cell in a slot or span. This will be illustrated by the following examples and embodiments shown in Figure 12. Figure 12 is a flowchart illustrating an exemplary method 1200 for a search space set drop procedure when the scheduled cell is the primary cell and the scheduled cell is the primary cell and sSCell according to an embodiment of the present invention. The steps of method 1200 in Figure 12 are carried out by any UE (111-116) in Figure 1, such as UE 116 in Figure 3. Method 1200 is for illustrative purposes only, and other embodiments may be used without departing from the scope of the present invention.

[0239] In certain embodiments, if a UE (e.g., UE116) is provided with a setting for a set of search spaces on multiple scheduling cells that does not generate PDCCH monitoring occasions for multiple scheduling cells scheduled in the same slot or span, this allows the UE to adjust the procedure for determining PDCCH overbooking events. The UE may decide to monitor PDCCH for scheduled cells on only one scheduling cell in a slot, where the slot may be determined by the smallest SCS setting among the multiple scheduling cell activations (DL BWP), based on: (i) A higher layer setting of a search space set that generates PDCCH monitoring in a slot or span for only one of the multiple scheduling cells, or (ii) Instructions via L1 / L2 signaling to generate a search space set having PDCCH monitoring in a slot or span for only one of the multiple scheduling cells. In one example, such a decision for only one scheduling cell in a slot would apply to a period of time, such as multiple consecutive slots. In other examples, UEs alternate between multiple scheduling cells, from one slot / span / MO to the next.

[0240] In one implementation example, if a UE (e.g., UE116) monitors the PDCCH for a cell scheduled by a USS set for only one scheduling cell in a slot from two scheduling cells, the UE will: (i) A CSS set on the first scheduling cell, a CSS set on the second scheduling cell, and a USS set on the first scheduling cell, or (ii) Determine PDCCH overbooking events based solely on the number of PDCCH candidates or non-overlapping CCEs corresponding to one of the CSS sets on the first scheduling cell, the CSS sets on the second scheduling cell, and the USS set on the second scheduling cell. For example, UE does not drop USS sets in the same slot / span for a scheduled cell in both the first and second scheduled cells.

[0241] In another example, if the scheduled cell is the primary cell and the scheduled cell is the primary cell and sSCell, the UE assigns PDCCH candidates and non-overlapping CCEs in slots / spans to the CSS set on the primary cell and the CSS set on sSCell, assigns the remaining PDCCH candidates and non-overlapping CCEs (if any) in slots / spans to the USS set with a lower index on the primary cell (or sSCell), and also drops the USS set with a higher index on the primary cell (or sSCell) in slots / spans. In this case, the UE does not consider the USS set on the sSCell (or primary cell) in the slot / span, and does not need to specify the priority between the USS set on the primary cell and the USS set on the sSCell.

[0242] Method 1200, shown in Figure 12, describes an exemplary procedure for a search space set drop procedure when the scheduled cell is the primary cell and the scheduled cell is the primary cell and sSCell, where the USS set for the primary cell is set only on sSCell. In step 1210, the UE (e.g., UE116) is configured for the scheduled cell, which is the primary cell, with a CSS set on both the primary cell and sSCell, and a USS set only on sSCell. In step 1220, the UE assigns PDCCH candidates and non-overlapping CCEs to the CSS set on the primary cell in slots / spans. In step 1230, the UE assigns the remaining PDCCH candidates and non-overlapping CCEs (if any) in slots / spans to the CSS set on sSCell, and then assigns them to the USS set on sSCell in ascending order of their corresponding indices. In response to a PDCCH overbooking event, the UE drops a CSS set on an sSCell or a USS set on an sSCell with a larger search space set index at step 1240.

[0243] For example, a CSS set on a primary scheduling cell, such as a primary cell, and a CSS set on a second scheduling cell, such as an sSCell, will not occur in any slot or span. After that, UE, (i) A set of CSS on the first scheduling cell, a set of USS on the first scheduling cell, and a set of USS on the first scheduling cell, or (ii) Determine the PDCCH overbooking event based solely on the number of non-overlapping CCE or PDCCH candidates corresponding to one of the CSS set on the second scheduling cell, the USS set on the first scheduling cell, and the USS set on the second scheduling cell.

[0244] In other examples, UE gives higher priority to the USS set of the primary cell compared to the CSS set of the sSCell. In an additional example, UE gives higher priority to the USS set of sSCell compared to the CSS set of the primary cell. In a particular embodiment, if the scheduled cell is a primary cell and the scheduled cell is a primary cell and an sSCell, the UE assigns PDCCH candidates and non-overlapping CCEs only to the CSS set on the primary cell (or sSCell), and assigns the remaining PDCCH candidates and non-overlapping CCEs (if any) to the USS set on the primary cell or sSCell according to the search space set prioritization rules described above.

[0245] For example, a UE (e.g., UE116) monitors PDCCH for cells scheduled in any slot by the search space set of the first scheduling cell or by the search space set of the second scheduling cell. Subsequently, if applicable, the UE performs a procedure to drop the search space set, such as when there is only one scheduling cell (for example, when the scheduled cell is the primary cell).

[0246] In other examples, if the scheduled cell is the primary cell and the scheduled cell is the primary cell and sSCell, the UE is set only on the CSS set on the primary cell, and on both the CSS set and the USS set on sSCell. For example, a CSS set including "Type-0 / 0A / 1 / 2 PDCCH" and, where possible, "Type-3 PDCCH" or "Type-4 PDCCH" (CSS set for multicast service) is configured on the primary cell. For example, a CSS set containing "Type-3 PDCCH" or "Type-4 PDCCH" is set on sSCell. As mentioned above, PDCCH candidates and non-overlapping CCEs for all CSS sets in PCell / PSCell and sSCell are within the relevant limits in slots / spans. The UE assigns the remaining PDCCH candidates and non-overlapping CCEs to the USS sets on sSCell in ascending order of USS set index by slot / span. If the UE determines that an overbooking event has occurred for the primary cell, the UE may drop a set of USSs on the sSCell with a larger index.

[0247] In yet another example, if the scheduled cell for the UE is the primary cell, and the scheduling cell is the primary cell and sSCell, the UE will be configured with only the CSS set on the primary cell and only the USS set on the sSCell. In this case, the UE assigns the PDCCH candidates and non-overlapping CCEs in the slots to the CSS set on the primary cell, and the remaining PDCCH candidates and non-overlapping CCEs to the USS set on the sSCell in ascending order of the search space set index (if any). If the UE determines an overbooking event in a slot / span, the UE drops the USS set on the sSCell with a higher index. This PDCCH drop method is applicable, at least when UE jointly counts multiple PDCCH candidates and non-overlapping CCEs across lymacells and sSCells, as previously described. If the UE counts multiple PDCCH candidates and non-overlapping CCEs individually for the primary cell and sSCell, then no overbooking event is expected for the primary cell, or PDCCH overbooking and dropping of the search space set will apply to at least the USS set on sSCell (for example, if the scaling parameter (e) 0≦α≦1 or 0≦β≦1 is applied to the PDCCH candidate or non-overlapping CCE assignment).

[0248] Figure 12 illustrates method 1200, but various modifications can be made to Figure 12. For example, although method 1200 is shown in the figure as a series of steps, various steps may overlap, occur in parallel, occur in other orders, or occur multiple times. In other examples, steps may be omitted or replaced with other steps. For example, the steps of method 1200 may be performed in a different order.

[0249] Embodiments of the present invention further describe PDCCH overbooking and drop for secondary cells "sSCell" that schedule PCell / PSCell. In a particular embodiment, a UE (e.g., UE116) is configured in the primary cell as a scheduled cell from a primary cell and a scheduling cell which is “sSCell”. The UE is configured with a CSS set on sSCell, such as a "Type-3 PDCCH CSS" set or a "Type-4 CSS" set (for multicast PDSCH scheduling), and since such CSS sets can be offloaded from the primary cell, it needs to support overbooking on sSCell. The UE determines PDCCH overbooking events on sSCell based on the CSS set or USS set configured on sSCell for scheduling on the primary cell. Therefore, the UE drops the search space set on sSCell according to the priority rules.

[0250] In one example, for a UE, sSCell can only perform self-carrier scheduling (UE cannot be scheduled onto sSCell from any other cell). The UE counts the number of PDCCH candidates and non-overlapping CCEs for the CSS set and USS set on the sSCell (scheduled cell) based on the SCS setting for the sSCell's activation (DL BWP) and the slot / span corresponding to the sSCell. The UE compares the number of PDCCH candidates and non-overlapping CCEs for sSCells in a slot / span to the corresponding limit in the slot / span for the SCS setting of the sSCell's active BWP.

[0251] The UE determines a PDCCH overbooking event if the number of PDCCH candidates or non-overlapping CCEs for sSCells counted in a slot / span exceeds the corresponding limit for that slot / span. Consider several approaches. In the first approach, the UE counts all sets of CSS on the sSCell in the slot / span as scheduled cells in the slot / span, for the number of PDCCH candidates and non-overlapping CCEs to be monitored for the sSCell. In the second approach, the UE divides the scheduled cells for an sSCell or generally for a scheduling cell into multiple PDCCH candidates and multiple non-overlapping CCEs for a set of CSS on an sSCell or generally on any scheduling cell.

[0252] for example, For TIFF0007883505000149.tif13131 scheduled cells, the number of PDCCH candidates and the number of non-overlapping CCEs for the CSS set on the cells that are scheduled cells are respectively TIFF0007883505000150.tif11142 and Displayed as TIFF0007883505000151.tif11142. Here, TIFF0007883505000152.tif13131 may be the same as or different from the number of downlink / scheduled cells that have scheduling cells with SCS setting μ.

[0253] In this case, the first (or last) TIFF0007883505000153.tif11142 The scheduled cells are, TIFF0007883505000154.tif13142PDCCH candidate can be assigned, last (or first) TIFF0007883505000155.tif13142 The scheduled cells are, The candidate TIFF0007883505000156.tif13131PDCCH can be assigned.

[0254] Similarly, the first (or last) TIFF0007883505000157.tif11131 The scheduled cells are, TIFF0007883505000158.tif11131 can be assigned a non-overlapping CCE, last (or first) TIFF0007883505000159.tif13131 The scheduled cells are, TIFF0007883505000160.tif12131 can be assigned a non-overlapping CCE, here, TIFF0007883505000161.tif11131 is a ceiling function, TIFF0007883505000162.tif11131 is a floor function, and mod() is a modular function.

[0255] A simpler and sub-optimal alternative is for each scheduled cell. TIFF0007883505000163.tif13142PDCCH candidate and TIFF0007883505000164.tif11131Consider the PDCCH candidate to be used for PDCCH monitoring of the CSS set on the scheduling cell. Only the PDCCH candidate for the scheduled cell and the non-overlapping CCE, which are considered to be for the CSS set on the scheduled cell, remain after excluding the PDCCH candidate and non-overlapping CCE for the scheduled cell.

[0256] In the third approach, the CSS set on the scheduled cell corresponds to the scheduled cell based on the “target cell” parameter of the CSS set setting, which determines the cell that the UE can consider as a candidate for PDCCH and non-overlapping CCE for the CSS set. For example, UE uses additional criteria to determine the search space set priority rules. For example, a (CSS set or) USS set on an sSCell shared / linked with the primary cell has a higher priority level than a (CSS set or) USS set on an sSCell that is not shared with the primary cell.

[0257] Figure 13 shows the structure of a UE according to an embodiment of the present invention. As shown in Figure 13, one embodiment of the UE includes a transceiver 1310, a memory 1320, and a processor 1330. The UE's transceiver 1310, memory 1320, and processor 1330 operate according to the UE's communication method described above. However, the components of UE are not limited to these. For example, UE may contain more or fewer components than those mentioned above. Furthermore, the processor 1330, transceiver 1310, and memory 1320 are implemented on a single chip. Furthermore, the processor 1330 may include at least one processor. Furthermore, the UE in Figure 13 corresponds to the UE in Figure 3.

[0258] The transceiver 1310 is a collective term for UE receivers and UE transmitters, which transmit and receive signals with a base station or network entity. Signals transmitted to and from a base station or network entity may include control information and data. The transceiver 1310 may include an RF transmitter that upconverts and amplifies the frequency of the transmitted signal and an RF receiver that low-noise amplified and downconverts the frequency of the received signal. However, this is just one example of transceiver 1310, and the components of transceiver 1310 are not limited to RF transmitters and RF receivers. Furthermore, the transceiver 1310 receives signals via the wireless channel and outputs them to the processor 1330, and transmits the signals output from the processor 1330 via the wireless channel.

[0259] Memory 1320 stores the programs and data necessary for the operation of the UE. Furthermore, memory 1320 stores control information or data contained in the signals obtained by the UE. Memory 1320 can be a storage medium or a combination of storage media such as ROM (Read-Only Memory), RAM (Random Access Memory), hard disk, CD-ROM, DVD, etc. Processor 1330 controls the series of processes that the UE operates as described above. For example, the transceiver 1310 receives a data signal containing a control signal transmitted by a base station or network entity, and the processor 1330 determines the result of receiving the control signal and data signal transmitted by the base station or network entity.

[0260] Figure 14 shows the structure of a base station according to an embodiment of the present invention. As shown in Figure 14, a base station according to one embodiment includes a transceiver 1410, a memory 1420, and a processor 1430. The base station's transceiver 1410, memory 1420, and processor 1430 operate according to the base station's communication method described above. However, the components of a base station are not limited to these. For example, a base station may contain more or fewer components than those described above. Furthermore, the processor 1430, transceiver 1410, and memory 1420 are implemented on a single chip. Furthermore, the processor 1430 may include at least one processor. Furthermore, the base station in Figure 14 corresponds to the BS in Figure 2.

[0261] The transceiver 1410 is a collective term for base station receivers and base station transmitters, which transmit and receive signals with terminals (UEs) or network entities. Signals transmitted to and from terminals or network entities may include control information and data. The transceiver 1410 may include an RF transmitter that upconverts and amplifies the frequency of the transmitted signal, and an RF receiver that low-noise amplified and downconverts the frequency of the received signal. However, this is just one example of transceiver 1410, and the components of transceiver 1410 are not limited to RF transmitters and RF receivers. Furthermore, the transceiver 1410 receives signals via the wireless channel and outputs them to the processor 1430, and transmits the signals output from the processor 1430 via the wireless channel.

[0262] Memory 1420 stores the programs and data necessary for the operation of the base station. Furthermore, memory 1420 stores control information or data contained in the signals obtained by the base station. Memory 1420 can be a storage medium such as ROM (Read-Only Memory), RAM (Random Access Memory), hard disk, CD-ROM, DVD, or a combination of storage media. The processor 1430 controls the series of processes that cause the base station to operate as described above. For example, the transceiver 1410 receives a data signal containing a control signal transmitted by the UE, and the processor 1430 determines the result of receiving the control signal and data signal transmitted by the UE.

[0263] In one embodiment, a method is provided. A method for receiving a physical downlink control channel (PDCCH) includes: a receiving step of receiving first information for a first search space set for scheduling from a first cell to the first cell, and second information for a second search space set for scheduling from a second cell to the first cell; a step of determining a first number of PDCCH receptions via a first number of non-overlapping control channel elements (CCEs) on the first cell in a first slot based on the first search space set; an identifying step of identifying at least one of the following: the first number of PDCCH receptions exceeds a predetermined number of PDCCH receptions, and the first number of non-overlapping CCEs exceeds a predetermined number of non-overlapping CCEs; and a step of canceling PDCCH receptions that correspond only to a third search space set within the first search space set.

[0264] In one embodiment, the method includes: receiving information for a third resource for PUCCH transmission to provide HARQ-ACK information in response to a PDSCH reception associated with a third RNTI from a first set of RNTIs and scheduled by Downlink Control Information (DCI) format; determining a second resource from the third resource for a second PUCCH and providing second HARQ-ACK information, and third HARQ-ACK information in response to a first PDSCH reception associated with a third RNTI from the first set of RNTIs; and transmitting a second PUCCH together with the second and third HARQ-ACK information using the second resource. In one embodiment, the first cell is a primary cell and the second cell is a secondary cell, the second cell having an activated and non-dormant active downlink bandwidth portion (DL BWP).

[0265] In one embodiment, the number of predetermined PDCCH receptions is Equivalent to TIFF0007883505000165.tif14146, the number of a given non-overlapping CCEs is It is equivalent to TIFF0007883505000166.tif12146, where α is the scaling factor. TIFF0007883505000167.tif11146 and TIFF0007883505000168.tif10146 represents the total number of PDCCH receptions and the total number of non-overlapping CCEs in the slots on the first cell, respectively. TIFF0007883505000169.tif11146 and TIFF0007883505000170.tif11146 represents the maximum number of PDCCH receptions and the maximum number of non-overlapping CCEs in a slot on the first cell, respectively, while μ1 is the subcarrier spacing setting for the slot on the first cell.

[0266] In one embodiment, the method further includes the step of receiving information indicating a scaling factor α. In one embodiment, the third search space set is the UE specific search space (USS) set. In one embodiment, the first search space set includes a set of common search spaces (CSS) associated with a first downlink control information (DCI) format, the first DCI format includes cyclic redundancy check (CRC) bits scrambled by a "G-RNTI" (group radio network temporary identifier), and the first DCI format schedules multicast PDSCH (Physical downlink shared channel) reception in the first cell. In one embodiment, the method further includes receiving third information for a fourth search space set for scheduling from a third cell to a first cell; determining that the second cell has an active downlink bandwidth portion (DL BWP) that is deactivated or dormant (DL BWP); and receiving a PDCCH by the fourth search space set for scheduling to the first cell.

[0267] In one embodiment, a user terminal (UE) is provided. The UE includes a transceiver configured to receive first information for a first search space set for scheduling from a first cell to a first cell, and second information for a second search space set for scheduling from a second cell to a first cell, and a processor operably coupled to the transceiver, which determines a first number of PDCCH receptions via a first number of non-overlapping control channel elements (CCEs) on a first cell in a first slot based on the first search space set, and is configured to identify at least one of the following: the first number of PDCCH receptions exceeds a predetermined number of PDCCH receptions, and the first number of non-overlapping CCEs exceeds a predetermined number of non-overlapping CCEs, wherein the transceiver is further configured to cancel PDCCH receptions corresponding only to a third search space set within the first search space set.

[0268] In one embodiment, the first cell is a primary cell, and the second cell is a secondary cell, wherein the second cell has an activated and non-dormant (DL BWP) active downlink bandwidth portion (DL BWP). In one embodiment, PDCCH reception in the first cell has a first SCS (subcarrier spacing) setting, PDCCH reception in the second cell has a second SCS setting, and the first slot is a slot corresponding to the smaller of the first SCS and the second SCS.

[0269] In one embodiment, the number of predetermined PDCCH receptions is Equivalent to TIFF0007883505000171.tif14146, the number of a given non-overlapping CCE is Equivalent to TIFF0007883505000172.tif12146, where α is the scaling factor. TIFF0007883505000173.tif11146 and TIFF0007883505000174.tif10146 represents the total number of PDCCH receptions and the total number of non-overlapping CCEs in the slots on the first cell, respectively. TIFF0007883505000175.tif11146 and TIFF0007883505000176.tif11146 represents the maximum number of PDCCH receptions and the maximum number of non-overlapping CCEs in the slot on the first cell, respectively, while μ1 is the subcarrier spacing setting for the slot on the first cell.

[0270] In one embodiment, the transceiver is further configured to receive information indicating a scaling factor α. In one embodiment, the third search space set is the UE specific search space (USS) set. In one embodiment, the first search space set includes a set of common search spaces (CSS) associated with a first downlink control information (DCI) format, the first DCI format includes cyclic redundancy check (CRC) bits scrambled by a "G-RNTI" (group radio network temporary identifier), and the first DCI format schedules multicast PDSCH (Physical downlink shared channel) reception in the first cell.

[0271] In one embodiment, the first search space set includes a common search space (CSS) set associated with a first downlink control information (DCI) format, the first DCI format includes cyclic redundancy check (CRC) bits scrambled by "G-RNTI" (group radio network temporary identifier), and the first DCI format schedules multicast PDSCH (physical downlink shared channel) reception in the first cell. In one embodiment, the transceiver is further configured to receive third information for a fourth search space set for scheduling from the third cell to the first cell, determine whether the second cell has an active downlink bandwidth portion (DL BWP) that is deactivated or dormant (DL BWP), and receive a PDCCH by the fourth search space set for scheduling on the first cell.

[0272] In one embodiment, a base station is provided. The base station includes a transceiver configured to transmit first information for a first search space set for scheduling from a first cell to a first cell, second information for a second search space set for scheduling from a second cell to a first cell, a scaling factor α for scaling the maximum number of PDCCHs (physical downlink control channels) and the maximum number of non-overlapping CCEs on the first cell in a first slot based on the first search space set, and to transmit a PDCCH on the first cell or a PDCCH on the second cell in a first slot. In one embodiment, the first cell is a primary cell and the second cell is a secondary cell, the second cell having an activated and non-dormant active downlink bandwidth portion (DL BWP).

[0273] In one embodiment, PDCCH reception on the first cell has a first subcarrier interval (SCS) setting, PDCCH reception on the second cell has a second SCS setting, and the first slot is a slot corresponding to the smaller of the first SCS and the second SCS. In one embodiment, the first search space set includes a set of common search spaces (CSS) associated with a first downlink control information (DCI) format, the first DCI format includes cyclic redundancy check (CRC) bits scrambled by a "G-RNTI" (group radio network temporary identifier), and the first DCI format schedules multicast PDSCH (Physical downlink shared channel) reception in the first cell.

[0274] The flowchart above illustrates an exemplary method that can be implemented according to the principles of the present invention, and various changes and modifications can be made to the method illustrated in the flowchart. For example, although the steps are shown in a series of steps in the diagram, the various steps in each diagram may overlap, occur in parallel, occur in other orders, or occur multiple times. In other examples, steps may be omitted or replaced by other steps.

[0275] The methods according to the embodiments described in the claims or the detailed description of the invention may be implemented in hardware, software, or a combination of hardware and software. When electrical structures and methods are implemented in software, a computer-readable storage medium for storing one or more programs (software modules) may be provided. One or more programs stored on a computer-readable storage medium are configured to be executable by one or more processors in an electronic device. One or more programs include instructions that cause a method according to an embodiment described in the claims or detailed description of the present invention to be performed.

[0276] Programs (e.g., software modules, software) can be stored in RAM (random access memory), non-volatile memory including flash memory, ROM (Read Only Memory), EEPROM (Electrically Erasable Programmable Read Only Memory), magnetic disk storage devices, CD-ROM (Compact Disc-ROM), DVD (Digital Versatile Disc), other types of optical storage devices, or magnetic cassettes. Alternatively, the program may be stored in a memory system that includes some or all of the aforementioned memory devices. Furthermore, each memory device may consist of multiple units. Furthermore, the program may be stored in an attachable storage device that can be accessed via a communication network such as the Internet, intranet, LAN (Local Area Network), WAN (Wide LAN), or SAN (Storage Area Network), or a combination thereof. The storage device may be associated with the apparatus according to an embodiment of the present invention via an external port. Other storage devices on the communication network may also be associated with the apparatus performing embodiments of the present invention.

[0277] In the embodiments of the present invention described above, the components included in the present invention are expressed singly or plurally depending on the embodiment. However, for the sake of clarity, one or more forms may be appropriately selected, and the present invention is not limited thereto. Elements expressed in the plural form in this way may be set as single elements, and elements expressed in the singular form may be set as plural elements. The drawings show various examples of user terminals, but the drawings may be subject to various changes. For example, a user terminal may contain any number of its constituent elements in any appropriate arrangement. In general, the drawings do not limit the scope of the present invention to any specific setting(s). Furthermore, while the drawings illustrate operating environments in which the various user terminal functions disclosed in this patent document can be used, such functions may be used in any other suitable system.

[0278] Although the present invention has been described using exemplary embodiments, those skilled in the art can propose various changes and modifications. The present invention is intended to include such changes and modifications that fall within the scope of the appended claims. Nothing in this application should be construed as indicating that any particular element, step, or function is an essential element that should be included in the claims. The scope of the patented subject matter is defined by the claims. [Explanation of symbols]

[0279] 100 Wireless Networks 101~103 Base station (BS) 111-116 User Terminals (UE) 120, 125 coverage areas 130 Networks 205a~205n, 305 antenna 210a~210n, 310 RF transceivers 215, 315 Transmit (TX) Processing Circuit 220, 325 Receiver (RX) Processing Circuit 225, 340 Controllers / Processors 230, 360 memory 235 (Backhaul / ) Network Interface 330 speakers 345 Input / Output (I / O) Interface (IF) 350 Input Devices 355 displays 361 Operating Systems (OS) 362 applications 405 Channel coding and modulation block 410 Series-to-Parallel (S-to-P) Blocks 415 Size N Inverse Fast Fourier Transform Block 420 Parallel-to-Series (P-to-S) Blocks 425 Additional cyclic prefix block 430 Upconverter 555 Downconverter 560 Removal of cyclic prefix blocks 565 Series-to-Parallel (S-to-P) Block 570 Size N Fast Fourier Transform Blocks 580-channel decoding and demodulation block

Claims

1. A method performed by a terminal (user equipment) in a wireless communication system, The steps include receiving setting information for the alpha value for self-carrier and cross-carrier scheduling on the primary cell from the base station, The steps include receiving information from the base station to set scheduling from the primary cell to the primary cell and scheduling from the secondary cell to the primary cell, The process includes the step of monitoring PDCCH (physical downlink control channel) candidates for scheduling to the primary cell, The number of PDCCH candidates scheduled from the primary cell monitored per slot shall not exceed a first value. The number of non-overlapping control channel elements (CCEs) scheduled from the primary cell monitored per slot shall not exceed the second value. For the first value, the α value is multiplied by the minimum value between the maximum number of PDCCH candidates in a slot for the first SCS (subcarrier spacing) and the total number of PDCCH candidates in a slot for the first SCS. For the second value, the α value is multiplied by the minimum value between the maximum number of non-superimposed CCEs in a slot for the first SCS and the total number of non-superimposed CCEs in a slot for the first SCS. A method characterized in that the first SCS for the primary cell is less than or equal to the second SCS for the secondary cell.

2. The first value is, Based on, The second value is, Based on, This is the total number of PDCCH candidates in the slot on the primary cell, This is the total number of non-superimposed CCEs in the slots on the primary cell, This is the maximum number of PDCCH candidates in the slot on the primary cell, This is the maximum number of non-superimposed CCEs in the slot on the primary cell, The method according to claim 1, characterized in that μ1 is the first SCS for the slot of the primary cell.

3. A terminal (user equipment) in a wireless communication system, Transceiver, It has a controller coupled to the aforementioned transmitting and receiving unit, The aforementioned controller, The base station receives setting information for the alpha value for self-carrier and cross-carrier scheduling on the primary cell. The base station receives information to set scheduling from the primary cell to the primary cell and scheduling from the secondary cell to the primary cell. It is configured to monitor PDCCH (physical downlink control channel) candidates for scheduling to the primary cell, The number of PDCCH candidates scheduled from the primary cell monitored per slot shall not exceed a first value. The number of non-overlapping control channel elements (CCEs) scheduled from the primary cell monitored per slot shall not exceed the second value. For the first value, the α value is multiplied by the minimum value between the maximum number of PDCCH candidates in a slot for the first SCS (subcarrier spacing) and the total number of PDCCH candidates in a slot for the first SCS. For the second value, the α value is multiplied by the minimum value between the maximum number of non-superimposed CCEs in a slot for the first SCS and the total number of non-superimposed CCEs in a slot for the first SCS. A terminal characterized in that the first SCS for the primary cell is smaller than or equal to the second SCS for the secondary cell.

4. The first value is, Based on, The second value is, Based on, This is the total number of PDCCH candidates in the slot on the primary cell, This is the total number of non-superimposed CCEs in the slots on the primary cell, This is the maximum number of PDCCH candidates in the slot on the primary cell, This is the maximum number of non-superimposed CCEs in the slot on the primary cell, The terminal according to claim 3, wherein μ1 is the first SCS for the slot of the primary cell.

5. A method performed by a base station in a wireless communication system, The steps include sending setting information for the alpha value for self-carrier and cross-carrier scheduling on the primary cell to the terminal (user equipment: UE), The process includes transmitting to the terminal information that sets up scheduling from the primary cell to the primary cell and scheduling from the secondary cell to the primary cell. The number of PDCCH candidates per slot for scheduling from the primary cell to the primary cell shall not exceed a first value. The number of non-overlapping control channel elements (CCEs) per slot for scheduling from one primary cell to the other primary cell shall not exceed the second value. For the first value, the α value is multiplied by the minimum value between the maximum number of PDCCH candidates in a slot for the first SCS (subcarrier spacing) and the total number of PDCCH candidates in a slot for the first SCS. For the second value, the α value is multiplied by the minimum value between the maximum number of non-superimposed CCEs in a slot for the first SCS and the total number of non-superimposed CCEs in a slot for the first SCS. A method characterized in that the first SCS for the primary cell is less than or equal to the second SCS for the secondary cell.

6. The first value is, Based on, The second value is, Based on, This is the total number of PDCCH candidates in the slot on the primary cell, This is the total number of non-superimposed CCEs in the slots on the primary cell, This is the maximum number of PDCCH candidates in the slot on the primary cell, This is the maximum number of non-superimposed CCEs in the slot on the primary cell, The method according to 5, characterized in that μ1 is the first SCS for the slot of the primary cell.

7. A base station in a wireless communication system, Transceiver, It has a controller coupled to the aforementioned transmitting and receiving unit, The aforementioned controller, The terminal (user equipment: UE) is sent configuration information for the alpha value for self-carrier and cross-carrier scheduling on the primary cell. The terminal is configured to transmit information that sets scheduling from the primary cell to the primary cell and scheduling from the secondary cell to the primary cell. The number of PDCCH (physical downlink control channel) candidates per slot for scheduling from the primary cell to the primary cell shall not exceed the first value. The number of non-overlapping control channel elements (CCEs) per slot for scheduling from one primary cell to the other primary cell shall not exceed the second value. For the first value, the α value is multiplied by the minimum value between the maximum number of PDCCH candidates in a slot for the first SCS (subcarrier spacing) and the total number of PDCCH candidates in a slot for the first SCS. For the second value, the α value is multiplied by the minimum value between the maximum number of non-superimposed CCEs in a slot for the first SCS and the total number of non-superimposed CCEs in a slot for the first SCS. A base station characterized in that the first SCS for the primary cell is smaller than or equal to the second SCS for the secondary cell.

8. The first value is, Based on, The second value is, Based on, This is the total number of PDCCH candidates in the slot on the primary cell, This is the total number of non-superimposed CCEs in the slots on the primary cell, This is the maximum number of PDCCH candidates in the slot on the primary cell, This is the maximum number of non-superimposed CCEs in the slot on the primary cell, The base station according to claim 7, wherein μ1 is the first SCS for the slot of the primary cell.

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