UE operation with reduced power consumption

Abstract

The present disclosure relates to a communication technique and a system for integrating a 5G communication system with IoT technology to support higher data transmission rates than those of 4G systems. The present disclosure may be applied to intelligent services (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail, security and safety-related services, etc.) based on 5G communication technology and IoT-related technology. A method, user equipment (UE), and a base station are provided for receiving or transmitting a physical downlink control channel (PDCCH) associated with a master node (MN) or a secondary node (SN).

Description

Technology Field

[0001] This application generally relates to wireless communication systems, and more specifically, the application relates to the transmission and reception of a physical downlink control channel (PDCCH) for operation with reduced power consumption and dual connection for a user equipment (UE). Background Technology

[0002] Efforts are being made to develop improved 5G or pre-5G communication systems to meet the increasing demand for wireless data traffic since the commercialization of 4G communication systems. For this reason, 5G or pre-5G communication systems are referred to as Beyond 4G Network communication systems or Post-LTE systems. To achieve high data transmission rates, the implementation of 5G communication systems in the mmWave band (e.g., the 60 GHz band) is being considered. To mitigate path loss and increase transmission distance in the mmWave band, technologies such as beamforming, massive MIMO, full Dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and large-scale antennas are being discussed for 5G communication systems. In addition, to improve the network of the system, the development of technologies such as advanced small cell, advanced small cell, cloud radio access network (cloud RAN), ultra-dense network, Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, CoMP (Coordinated Multi-Points), and interference cancellation is taking place in 5G communication systems.In addition, advanced coding modulation (ACM) methods such as FQAM (Hybrid FSK and QAM Modulation) and SWSC (Sliding Window Superposition Coding), as well as advanced access technologies such as FBMC (Filter Bank Multi Carrier), NOMA (non-orthogonal multiple access), and SCMA (sparse code multiple access), are being developed in 5G systems.

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

[0004] Accordingly, various attempts are being made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, Machine to Machine (M2M), and Machine Type Communication (MTC) are being implemented using 5G communication techniques such as beamforming, MIMO, and array antennas. The application of cloud RAN as a big data processing technology, as previously described, can also be considered an example of the convergence of 5G and IoT technologies. The problem to be solved

[0005] The present disclosure relates to a pre-5G or 5G communication system provided to support higher data transfer rates beyond a fourth-generation (4G) communication system, such as LTE (long-term evolution). The present disclosure relates to indicating to a UE whether to monitor PDCCH candidates during a plurality of C-DRX periods or during a plurality of PDCCH monitoring OKs within a C-DRX period. The present disclosure also relates to providing a means to the UE for indicating a preferred configuration for a serving gNB for transmission and reception. The present disclosure also relates to enabling the UE to perform rapid enable and disable for a plurality of secondary cells (SCells). The present disclosure also relates to designing a new mode of operation for communication between a UE and a serving gNB that enables UE power savings without penalizing network operation. The present disclosure also relates to adapting a set of slot timing values ​​K1 for determining the HARQ-ACK codebook for the number of active SCells and the corresponding subcarrier interval (SCS) configuration. The present disclosure also relates to setting processing times for scheduling PDSCH / PUSCH and combining the activation / deactivation of SCells with dynamic adaptation to processing times for scheduling. The present disclosure also relates to establishing that the MN (master node), SN (secondary node), and UE have the same understanding of the number of PDCCH candidates expected to be monitored by the UE per slot and the number of non-overlapping CCEs for which the UE is expected to perform channel estimation per slot. means of solving the problem

[0006] In one embodiment, a method is provided for a UE to receive a PDCCH from a provided MN or SN. This method has a first cell number and the number of second cells Step of receiving an indication for; and MN's during the time period according to Determine the total number of 1st PDCCH candidates for downlink (DL) cells and also SN's during the time period according to It includes the step of determining the total number of 2nd PDCCH candidates for DL ​​cells. MCG represents the master cell group for MN, and SCG represents the secondary cell group for SN. Is DL cells or It is a subcarrier spacing (SCS) configuration for the active bandwidth portion (BWP) for each of the DL cells.

[0007] In another embodiment, a base station is provided. The base station includes a transmitter and a processor operably connected to the transmitter. The transmitter has a first cell number and the number of second cells It is configured to transmit an indication for. The processor During the time period according to Number of PDCCH candidates for DL ​​cells It is configured to determine. Is This is the SCS configuration for the active BWP for each DL cell.

[0008] In another embodiment, a UE is provided. This UE includes a receiver and a processor operably connected to the receiver. The receiver has a first cell number and the number of second cells It is configured to receive an indication for. The processor During the time period according to Total number of 1st PDCCH candidates for DL ​​cells and During the time period according to Total number of 2nd PDCCH candidates for DL ​​cells It is configured to determine. MCG represents the master cell group for MN, and SCG represents the secondary cell group for SN. Is DL cells or This is the SCS configuration for the BWP for each of the DL cells.

[0009] Other technical features may be readily apparent to those skilled in the art from the following drawings, description, and claims.

[0010] Before proceeding to the detailed description below, it may be helpful to provide definitions of specific words and phrases used throughout this patent specification. The term "couple" and its derivatives indicate any direct or indirect communication between two or more elements, or whether these elements are in physical contact with each other. The terms "transmit," "receive," and "communicate," and their derivatives, include both direct and indirect communication. The terms "include," "comprise," and their derivatives mean inclusion rather than limitation. The term "or" is a general term meaning "and / or." The phrase "associated with" and its derivatives mean include, be included within, interconnect 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. The term "controller" means any device, system, or part thereof that controls at least one operation. Such a controller may be implemented in hardware or a combination of hardware and software and / or firmware.Functions associated with a specific controller may be processed locally or remotely, centrally, or distributed. The phrase "at least one," when used with a list of items, means that one or more different combinations of the listed items may be used. For example, "at least one of A, B, and C" includes any one of the following combinations: A, B, C, A and B, A and C, B and C, and A, B, and C.

[0011] Additionally, the various functions described below may be implemented or supported by each of one or more computer programs formed of computer-readable program code and implemented on 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, related data, or parts thereof configured for implementation in suitable computer-readable program code. The phrase “computer-readable program code” includes types of computer code including source code, object code, and executable code. The phrase “computer-readable medium” includes any type of medium accessible 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 exclude communication links that transmit wired, wireless, optical, transient electrical, or other signals. Non-transient computer-readable media include media in which data is permanently stored and media in which data is stored and later overwritten, such as rewritable optical discs or erasable memory devices.

[0012] Definitions for other specific words and phrases are provided throughout this patent specification. Those skilled in the art should understand that, in many cases, if not most, these definitions may apply not only to conventional usage but also to future use of such defined words and phrases. Effects of the invention

[0013] The present disclosure relates to a pre-5G or 5G communication system provided to support reduced power consumption and operation of a UE with dual connectivity beyond 4G communication systems such as LTE. Embodiments of the present disclosure provide a transmission structure and format in an advanced communication system. Brief explanation of the drawing

[0014] For a more complete understanding of the present disclosure and its advantages, reference is now made to the following description taken together with the accompanying drawings, in which similar reference numerals indicate similar parts. FIG. 1 illustrates an exemplary wireless network according to embodiments of the present disclosure. FIG. 2 illustrates an exemplary gNB according to embodiments of the present disclosure. FIG. 3 illustrates an exemplary UE according to embodiments of the present disclosure. FIG. 4 illustrates an exemplary transmitter structure using OFDM according to embodiments of the present disclosure. FIG. 5 illustrates an exemplary receiver structure using OFDM according to embodiments of the present disclosure. FIG. 6 illustrates an exemplary encoding process for a DCI format according to embodiments of the present disclosure. FIG. 7 illustrates an exemplary decoding process for a DCI format for use with a UE according to embodiments of the present disclosure. FIG. 8 illustrates a flowchart of a method for a UE to adjust parameters during a C-DRX period according to embodiments of the present disclosure. FIG. 9 illustrates a flowchart of a method for a UE to adjust the number of PDCCH candidates per CCE aggregation level and search space set according to embodiments of the present disclosure. FIG. 10 illustrates a flowchart of a method for determining the number of PDCCH candidates per CCE aggregation level and per search space set according to the corresponding DL BWP in accordance with embodiments of the present disclosure. FIG. 11 illustrates a flowchart of a method for a UE to measure and report CSI for a cell set according to embodiments of the present disclosure. FIG. 12 illustrates a flowchart of a method reported by a UE to determine the configuration of a plurality of UE receiver antennas according to embodiments of the present disclosure. FIG. 13 illustrates a flowchart of a method for determining a UE for a plurality of UE receiver antennas dependent on a corresponding DL BWP according to embodiments of the present disclosure. FIG. 14 illustrates a flowchart of a method for adapting processing time for scheduling PDSCH / PUSCH reception / transmission in a SCell combined with activation or deactivation of the SCell according to embodiments of the present disclosure. FIG. 15 illustrates a flowchart of a method for adapting slot timing value K1 with BWP switching and SCell activation / deactivation according to embodiments of the present disclosure. FIG. 16 illustrates a call flow for an MCG and an SCG exchanging information to determine each configuration for communicating with a UE according to embodiments of the present disclosure. Specific details for implementing the invention

[0015] FIGS. 1 through 16 described below, and the various embodiments used to illustrate the principles of the present disclosure in this patent specification, are for illustrative purposes only and should not be interpreted in any way as limiting the scope of the present disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably configured system or device.

[0016] The following documents, namely, 3GPP TS 38.211 v15.3.0, “NR; Physical channels and modulation;” 3GPP TS 38.212 v15.3.0, “NR; Multiplexing and Channel coding;” 3GPP TS 38.213 v15.3.0, “NR; Physical Layer Procedures for Control;” 3GPP TS 38.214 v15.3.0, “NR; Physical Layer Procedures for Data;” 3GPP TS 38.321 v15.3.0, “NR; Medium Access Control (MAC) protocol specification;” and 3GPP TS 38.331 v15.3.0, “NR; Radio Resource Control (RRC) Protocol Specification.” are incorporated into the present disclosure by reference as fully described herein.

[0017] FIGS. 1 to 3 below describe various embodiments implemented in wireless communication systems using orthogonal frequency division multiplexing (OFDM) or orthogonal frequency division multiple access (OFDMA) communication technologies. The description in FIGS. 1 to 3 does not imply any physical or structural limitations on the manner in which different embodiments may be implemented. Different embodiments of the present disclosure may be implemented in any suitably configured communication system.

[0018] FIG. 1 illustrates an exemplary wireless network according to embodiments of the present disclosure. The embodiment of the wireless network shown in FIG. 1 is for illustrative purposes only. Other embodiments of the wireless network (100) may be used without departing from the scope of the present disclosure.

[0019] As illustrated in FIG. 1, the wireless network includes gNB (101), gNB (102), and gNB (103). gNB (101) communicates with gNB (102) and gNB (103). Additionally, gNB (101) also communicates with at least one network (130), for example, the Internet, a private IP (Internet Protocol) network, or another data network.

[0020] The gNB (102) provides wireless broadband access to the network (130) to a first plurality of user devices (UEs) located within the coverage area (120) of the gNB (102). The first plurality of UEs include a UE (111) that may be located in a small and medium-sized business (SB); a UE (112) that may be located in a large business (E); a UE (113) that may be located in a Wi-Fi hotspot (HS); a UE (114) that may be located in a first residential area (R); a UE (115) that may be located in a second residential area (R); and a UE (116) that may be a mobile device (M) such as a mobile phone, a wireless laptop, a wireless PDA, etc. The gNB (103) provides wireless broadband access to the network (130) to a second plurality of UEs located within the coverage area (125) of the gNB (103). The second plurality of UEs include UE (115) and UE (116). In some embodiments, one or more of the gNBs (101-103) can communicate with each other and with UEs (111-116) using 5G, LTE, LTE-A, WiMAX, WiFi, or other wireless communication technologies.

[0021] Depending on the network type, the terms “base station” or “BS” may refer to a component (or set of components) configured to provide wireless access to a network, e.g., a transmitting point (TP), a transmitting-receiving point (TRP), an enhanced base station (eNodeB or eNB), a 5G base station (gNB), a macrocell, a femtocell, a WiFi access point (AP), or other wirelessly enabled device. A base station may provide wireless access according to one or more wireless communication protocols, e.g., 5G 3GPP New Radio Interface / Access (NR), LTE (Long Term Evolution), LTE-A (LTE-Advanced), HSPA (High Speed ​​Packet Access), Wi-Fi 802.11a / b / g / n / ac, etc. For convenience, the terms “BS” and “TRP” are used interchangeably in this patent specification to refer to network infrastructure that provides wireless access to a remote terminal. Additionally, depending on the network type, the terms "user equipment" or "UE" may refer to any component such as a "mobile station," "subscriber station," "remote terminal," "wireless terminal," "receiving point," or "user device." For convenience, the terms "user equipment" and "UE" are used in this patent specification to refer to remote wireless equipment wirelessly accessing the BS, whether the UE is a mobile device (e.g., a mobile phone or a smartphone) or a fixed device generally considered (e.g., a desktop computer or a vending machine).

[0022] The dotted lines represent the approximate ranges of the coverage areas (120 and 125), which are shown as approximate circles for the purpose of illustration and explanation only. It should be clearly understood that the coverage areas associated with the gNBs, e.g., coverage areas (120 and 125), may have different forms, including irregular shapes, depending on the configuration of the gNBs and changes in the wireless environment related to natural and artificial obstacles.

[0023] As described in more detail below, one or more of the UEs (111-116) include circuits, programming, or a combination thereof for receiving reliability of data and control information in an advanced wireless communication system. In certain embodiments, one or more gNBs (101-103) include circuits, programming, or a combination thereof for efficiently reducing power consumption in an advanced wireless communication system.

[0024] Although FIG. 1 illustrates an example of a wireless network, various variations may be made to FIG. 1. For example, the wireless network may include any number of gNBs and any number of UEs in any suitable arrangement. Additionally, a gNB (101) may communicate directly with any number of UEs to provide these UEs with wireless broadband access to the network (130). Similarly, each gNB (102-103) may communicate directly with the network (130) to provide UEs with direct wireless broadband access to the network (130). Additionally, the gNBs (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.

[0025] FIG. 2 illustrates an exemplary gNB (102) according to embodiments of the present disclosure. The embodiment of the gNB (102) shown in FIG. 2 is for illustrative purposes only, and the gNBs (101 and 103) of FIG. 1 may have the same or similar configurations. However, gNBs are made up of various configurations, and FIG. 2 does not limit the scope of the present disclosure to any specific implementation of the gNB.

[0026] As illustrated in FIG. 2, the gNB (102) includes a plurality of antennas (205a-205n), a plurality of RF transceivers (210a-210n), a transmit (TX) processing circuit (215), and a receive (RX) processing circuit (220). Additionally, the gNB (102) includes a controller / processor (225), a memory (230), and a backhaul or network interface (235).

[0027] RF transceivers (210a-210n) receive incoming RF signals, such as signals transmitted by UEs within the network (100), from antennas (205a-205n). The RF transceivers (210a-210n) down-convert the incoming RF signals to generate IF or baseband signals. The IF or baseband signals are transmitted to an RX processing circuit (220) which generates processed baseband signals by filtering, decoding, and / or digitizing the baseband or IF signals. The RX processing circuit (220) transmits these processed baseband signals to a controller / processor (225) for further processing.

[0028] The TX processing circuit (215) receives analog or digital data (e.g., voice data, web data, email, or interactive video game data) from the controller / processor (225). The TX processing circuit (215) encodes, multiplexes, and / or digitizes outgoing baseband data to generate processed baseband or IF signals. RF transceivers (210a-210n) receive the outgoing processed baseband or IF signals from the TX processing circuit (215) and upconvert the baseband or IF signals into RF signals transmitted through antennas (205a-205n).

[0029] The controller / processor (225) may include one or more processors or other processing units that control the overall operation of the gNB (102). For example, the controller / processor (225) may control the reception of forward channel signals and the transmission of reverse channel signals by RF transceivers (210a-210n), an RX processing circuit (220), and a TX processing circuit (215) according to well-known principles. The controller / processor (225) may also support additional functions, such as more advanced wireless communication functions. For example, the controller / processor (225) may support beamforming or directional routing operations in which outward signals from multiple antennas (205a-205n) are differently weighted to effectively steer them in a desired direction. Any of the various other functions may be supported in the gNB (102) by the controller / processor (225).

[0030] Additionally, the controller / processor (225) can execute programs and other processes residing in memory (230), such as an OS. The controller / processor (225) can move data into or out of memory (230) according to the request of the execution process.

[0031] Additionally, the controller / processor (225) is coupled to a backhaul or network interface (235). The backhaul or network interface (235) enables the gNB (102) to communicate with other devices or systems through a backhaul connection or through a network. The interface (235) may support communications through any suitable wired or wireless connection(s). For example, if the gNB (102) is implemented as part of a cellular communication system (e.g., supporting 5G, LTE, or LTE-A), the interface (235) may enable the gNB (102) to communicate with other gNBs through a wired or wireless backhaul connection. If the gNB (102) is implemented as an access point, the interface (235) enables the gNB (102) to transmit to a larger network (e.g., the Internet) through a wired or wireless local area network or through a wired or wireless connection. The interface (235) includes any suitable structure that supports wired or wireless connections, for example, communications via Ethernet or RF transceivers.

[0032] The memory (230) is coupled to the controller / processor (225). Part of the memory (230) may include RAM, and another part of the memory (230) may include flash memory or other ROM.

[0033] Although FIG. 2 illustrates an example of a gNB (102), various variations may be made to FIG. 2. For example, the gNB (102) may include any number of each component shown in FIG. 2. As one specific example, the access point may include a plurality of interfaces (235), and the controller / processor (225) may support routing functions for routing data between different network addresses. As another specific example, although it is illustrated as including a single instance of a TX processing circuit (215) and a single instance of an RX processing circuit (220), the gNB (102) may include multiple instances for each (e.g., one per RF transceiver). Additionally, the various components of FIG. 2 may be combined, further subdivided, or omitted, and additional components may be added according to specific needs.

[0034] FIG. 3 illustrates an exemplary UE (116) according to embodiments of the present disclosure. The embodiment of the UE (116) shown in FIG. 3 is for illustrative purposes only, and the UEs (111-115) of FIG. 1 may have the same or similar configurations. However, UEs are made up of various configurations, and FIG. 3 does not limit the scope of the present disclosure to any specific implementation of the UE.

[0035] As illustrated in FIG. 3, the UE (116) includes an antenna (305), a radio frequency (RF) transceiver (310), a TX processing circuit (315), a microphone (320), and a receive (RX) processing circuit (325). Additionally, the UE (116) includes a speaker (330), a processor (340), an input / output (I / O) interface (IF) (345), a touchscreen (350), a display (355), and a memory (360). The memory (360) includes an operating system (OS) (361) and one or more applications (362).

[0036] The RF transceiver (310) receives an inward RF signal transmitted by the gNB of the network (100) from the antenna (305). The RF transceiver (310) down-converts the inward RF signal to generate an intermediate frequency (IF) or baseband signal. The IF or baseband signal is transmitted to an RX processing circuit (325) which generates a baseband signal processed by filtering, decoding, and / or digitizing the baseband or IF signal. The RX processing circuit (325) transmits the processed baseband signal to a speaker (330) (e.g., voice data) or to a processor (340) for further processing (e.g., web browsing data).

[0037] The TX processing circuit (315) receives analog or digital voice data from the microphone (320) or other outward baseband data (e.g., web data, e-mail, or interactive video game data) from the processor (340). The TX processing circuit (315) encodes, multiplexes, and / or digitizes the outward baseband data to generate a processed baseband or IF signal. The RF transceiver (310) receives the outwardly processed baseband or IF signal from the TX processing circuit (315) and upconverts the baseband or IF signal into an RF signal transmitted through the antenna (305).

[0038] The processor (340) may include one or more processors or other processing units and may control the overall operation of the UE (116) by executing an OS (361) stored in memory (360). For example, the processor (340) may control the reception of forward channel signals and the transmission of reverse channel signals by means of an RF transceiver (310), an RX processing circuit (325), and a TX processing circuit (315) according to well-known principles. In some embodiments, the processor (340) includes at least one microprocessor or microcontroller.

[0039] The processor (340) may also execute other processes and programs residing in memory (360), such as a process for beam management. The processor (340) may move data into or out of memory (360) according to the requirements of the execution process. In some embodiments, the processor (340) is configured to execute applications (362) based on the OS (361) or according to signals received from gNBs or operators. Additionally, the processor (340) is coupled to an I / O interface (345) that provides the UE (116) with the ability to connect to other devices, such as laptop computers and portable computers. The I / O interface (345) is a communication path between these peripherals and the processor (340).

[0040] Additionally, the processor (340) is coupled to a touchscreen (350) and a display (355). An operator of the UE (116) can input data into the UE (116) using the touchscreen (350). The display (355) may be, for example, a liquid crystal display, a light-emitting diode display, or another display capable of rendering text and / or at least limited graphics from websites.

[0041] The memory (360) is coupled to the processor (340). Part of the memory (360) may include random access memory (RAM), and another part of the memory (360) may include flash memory or other read-only memory (ROM).

[0042] Although FIG. 3 illustrates an example of a UE (116), various variations may be made to FIG. 3. For example, the various components of FIG. 3 may be combined, further subdivided, or omitted, and additional components may be added according to specific needs. As a specific example, the 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). Also, although FIG. 3 illustrates a UE (116) configured as a mobile phone or smartphone, UEs may be configured to operate as other types of mobile or fixed devices.

[0043] The communication system includes a downlink (DL) representing transmission from a base station or one or more transmitting points to a UE, and an uplink (UL) representing transmission from a UE to a base station or one or more receiving points.

[0044] Efforts are being made to develop improved 5G or pre-5G communication systems to meet the increasing demand for wireless data traffic following the establishment of 4G communication systems. For this reason, 5G or pre-5G communication systems are referred to as 'Beyond 4G networks' or 'Post-LTE systems'. 5G wireless communication systems are considered to be implemented in higher frequency (mmWave) bands (e.g., the 60 GHz band) to achieve higher data transmission rates. To reduce radio wave propagation loss and increase transmission distance, technologies such as beamforming, massive MIMO, full Dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and large-scale antennas are being discussed for 5G communication systems. In addition, to improve the system network, technologies such as advanced small cell, cloud radio access network (cloud RAN), ultra-dense network, device-to-device (D2D) communication, wireless backhaul, mobile network, cooperative communication, Coordinated Multi-Points (CoMP), and receiver interference cancellation are being developed in 5G communication systems.

[0045] A time unit for DL ​​signaling or UL signaling in a cell is called a slot, and it may contain one or more symbols. Symbols may also be used as additional time units. A frequency (or bandwidth (BW)) unit is called a resource block (RB). A single RB contains multiple subcarriers (SC). For example, a slot may contain 14 symbols and have a duration of 1 millisecond or 0.5 milliseconds, and an RB may have a BW of 180 kHz or 360 kHz and contain 12 SCs with an inter-SC spacing of 15 kHz or 30 kHz, respectively.

[0046] A DL signal includes a data signal carrying information content, a control signal carrying DL control information (DCI) formats, and a reference signal (RS). The gNB can transmit data information (e.g., transmission blocks) or DCI formats through each physical DL shared channel (PDSCH) or physical DL control channel (PDCCH). The gNB can transmit one or more of several types of RS, including Channel State Information RS (CSI-RS) and Demodulation RS (DMRS). CSI-RS is intended for the UE to measure Channel State Information (CSI) or perform other measurements, such as measurements related to mobility assistance. DMRS can be transmitted only on the BW of each PDCCH or PDSCH, and the UE can use DMRS to demodulate data or control information.

[0047] The CSI report from the UE includes a Channel Quality Indicator (CQI) that informs the gNB of the Modulation and Coding Scheme (MCS) for the UE to detect data TB with a predetermined block error rate (BLER) (e.g., 10% BLER), a Precoding Matrix Indicator (PMI) that informs the gNB of how to precode signaling for the UE, and a Rank Indicator (RI) indicating the transmit rank for the PDSCH. The UL RS includes DMRS and Sounding RS (SRS). The DMRS is transmitted only on the BW of each PUSCH or PUCCH transmit. The gNB can use the DMRS to demodulate information from each PUSCH or PUCCH. The SRS is transmitted by the UE to provide the UL CSI to the gNB, and in the case of TDD or flexible duplex systems, also provides the PMI for DL ​​transmit. UL DMRS or SRS transmission may be based on the transmission of, for example, a ZC (Zadoff-Chu) sequence or, generally, a CAZAC sequence.

[0048] DL transmitters and UL transmitters can be based on orthogonal frequency division multiplexing (OFDM) waveforms that include variations using DFT precoding known as DFT-spread-OFDM.

[0049] FIG. 4 illustrates an exemplary transmitter structure (400) using OFDM according to embodiments of the present disclosure. The embodiment of the transmitter structure (400) illustrated in FIG. 4 is for illustrative purposes only. One or more components illustrated in FIG. 4 may be implemented as special circuits configured to perform the mentioned functions, or one or more components may be implemented by one or more processors executing instructions to perform the mentioned functions. Other embodiments are used without departing from the scope of the present disclosure.

[0050] Information bits (410), such as DCI bits or data bits, are encoded by an encoder (420), rate-matched to time / frequency resources allocated by a rate matcher (430), and modulated by a modulator (440). Subsequently, the modulated encoded symbols and DMRS or CSI-RS (450) are mapped to SCs (460) by an SC mapping unit (465), an inverse Fast Fourier Transform (IFFT) is performed by a filter (470), a cyclic prefix (CP) is added by a CP insertion unit (480), and the resulting signal is filtered by a filter (490) and transmitted by a radio frequency (RF) unit (495).

[0051] FIG. 5 illustrates an exemplary receiver structure (500) using OFDM according to embodiments of the present disclosure. The embodiment of the receiver structure (500) illustrated in FIG. 5 is for illustrative purposes only. One or more components illustrated in FIG. 5 may be implemented as special circuits configured to perform the mentioned functions, or one or more components may be implemented by one or more processors executing instructions to perform the mentioned functions. Other embodiments are used without departing from the scope of the present disclosure.

[0052] A received signal (510) is filtered by a filter (520), a CP removal unit removes CP (530), a filter (540) applies a Fast Fourier Transform (FFT), an SC demapping unit (550) demapping SCs selected by a BW selector unit (555), received symbols are demodulated by a channel estimator and demodulator unit (560), a rate demapping unit (570) restores rate matching, and a decoder (580) decodes the result bits to provide information bits (590).

[0053] The UE typically monitors multiple candidate locations for each potential PDCCH reception (PDCCH candidate) to decode each candidate DCI format in a slot. These locations are determined by the seek space for each DCI format. Monitoring PDCCH candidates means receiving and decoding PDCCH candidates according to the DCI formats configured for the UE to receive. DCI formats include Cyclic Redundancy Check (CRC) bits to allow the UE to verify the correct detection of the DCI format. The DCI format type is identified by a radio network temporary identifier (RNTI) that scrambles the CRC bits. For DCI formats that schedule PDSCH or PUSCH to a single UE, the RNTI may be a C-RNTI (Cell RNTI) and serves as the UE identifier.

[0054] For example, in the case of a DCI format that schedules PDSCH delivering System Information (SI), the RNTI may be SI-RNTI. In the case of a DCI format that schedules PDSCH providing Random Access Response (RAR), the RNTI may be RA-RNTI. In the case of a DCI format that schedules PDSCH or PUSCH for a single UE before the UE establishes an RRC connection with the serving gNB, the RNTI may be Temporal C-RNTI (TC-RNTI). In the case of a DCI format that provides TPC commands to a group of UEs, the RNTI may be TPC-PUSCH-RNTI or TPC-PUCCH-RNTI. Each RNTI type can be configured on the UE through higher-layer signaling, such as RRC signaling. The DCI format for scheduling PDSCH reception to the UE is also called the DL DCI format or DL ​​allocation, and the DCI format for scheduling PUSCH transmission from the UE is also called the UL DCI format or UL grant.

[0055] A PDCCH transmission may be within a set of physical RBs (PRBs). For PDCCH receptions, the gNB may configure one or more sets of PRBs, also known as a control resource set (CORESET), in the UE. PDCCH receptions may occur at control channel elements (CCEs) included in the control resource set. To schedule unicast PDCCH receptions or PUSCH transmissions, the UE determines the CCEs for PDCCH receptions based on a search space, such as a UE-specific search space (USS) for PDCCH candidates associated with a DCI format having a CRC scrambled by an RNTI (e.g., C-RNTI) configured for the UE by UE-specific RRC signaling, and a common search space (CSS) for PDCCH candidates associated with a DCI format having a CRC scrambled by another RNTI. The set of CCEs that can be used for PDCCH transmissions to the UE defines the PDCCH candidate locations. The characteristic of the control resource set is the TCI (Transmission Configuration Indicator) status, which provides quasi co-location information of the DMRS antenna port for PDCCH reception.

[0056] FIG. 6 illustrates an exemplary encoding process (600) for a DCI format according to embodiments of the present disclosure. The embodiment of the encoding process (600) illustrated in FIG. 6 is for illustrative purposes only. One or more components illustrated in FIG. 6 may be implemented as special circuits configured to perform the mentioned functions, or one or more components may be implemented by one or more processors that execute instructions to perform the mentioned functions. Other embodiments are used without departing from the scope of the present disclosure.

[0057] The gNB individually encodes and transmits each DCI format in each PDCCH. To enable the UE to identify the DCI format, the RNTI masks the CRC of the DCI format codeword. For example, the CRC and RNTI may contain 16 bits or 24 bits. The CRC of the (uncoded) DCI format bits (610) is determined using a CRC calculation unit (620), and the CRC is masked using an exclusive OR (XOR) operation unit (630) between the CRC bits and the RNTI bits (640). The XOR operation is defined as XOR(0,0) = 0, XOR(0,1) = 1, XOR(1,0) = 1, and XOR(1,1) = 0. The masked CRC bits are added to the DCI format information bits using a CRC addition unit (650). An encoder (660) performs channel coding (e.g., tail-biting convolution coding or polar coding), and then rate matching for allocated resources by a rate matcher (670) follows. Interleaving and modulation units (680) apply interleaving and modulation such as QPSK, and an output control signal (690) is transmitted.

[0058] FIG. 7 illustrates an exemplary decoding process (700) for a DCI format to be used with a UE according to embodiments of the present disclosure. The embodiment of the decoding process (700) illustrated in FIG. 7 is for illustrative purposes only. One or more components illustrated in FIG. 7 may be implemented as special circuits configured to perform the mentioned functions, or one or more components may be implemented by one or more processors that execute instructions to perform the mentioned functions. Other embodiments are used without departing from the scope of the present disclosure.

[0059] The received control signal (710) is demodulated and deinterleaved by a demodulator and deinterleaver (720). Rate matching applied by the gNB transmitter is restored by a rate matcher (730), and the resulting bits are decoded by a decoder (740). After decoding, a CRC extractor (750) extracts CRC bits and provides DCI format information bits (760). The DCI format information bits are demasked by an XOR operation using an RNTI (780) (if applicable) (770), and a CRC check is performed by a unit (790). If the CRC check is successful (the checksum is 0), the DCI format information bits are considered valid. If the CRC check is unsuccessful, the DCI format information bits are considered invalid.

[0060] For each DL Bandwidth Part (BWP) configured for the UE in the serving cell, the UE may be provided by a higher layer signaling multiple sets of control resources. For each set of control resources, the UE is provided with the following: a control resource set index. ; DM-RS (demodulation reference-signal) scrambling sequence initialization value; precoder granularity for multiple REGs at a frequency where the UE can assume the use of the same DM-RS precoder; multiple consecutive symbols; resource block set; CCE-REG mapping parameter; antenna port QCL among antenna port QCL sets representing QCL (quasi co-location) information of the DM-RS antenna port for PDCCH reception; and control resource set Indication of the presence or absence of the transmission configuration indication (TCI) field for DCI format 1_1 that is multiplexed in PDCCH reception.

[0061] For each DL BWP configured in the UE at the serving cell, the UE is provided with multiple search space sets by the upper layers, wherein, for each search space set among the multiple search space sets, the UE is provided with the following: search space set index ; Search space set and control resource set Association between; PDCCH monitoring cycle of slots and PDCCH monitoring offsets of the slots; a PDCCH monitoring pattern within the slot representing the first symbol(s) of the control resource set within the slot for PDCCH monitoring; CCE aggregation level Number of Party PDCCH Candidates ; and search space set Indicates whether it is a common search space set or a UE-specific search space set.

[0062] Control resource set Search space set associated with Regarding, aggregation level CCE indices for; carrier indicator field value A slot for a serving cell corresponding to the search space (also called the search space) PDCCH candidates of the search space set within The corresponding value is given as follows in Equation 1:

[0063]

[0064] In mathematical formula 1, for any common search space, and; for a UE-specific search space, , , About , About , About , and And; And; is a control resource set From 0 It is the number of CCEs numbered up to -1; is the carrier indicator field value if the carrier indicator field is configured in the UE; otherwise, for any common search space, ; Includes, where The UE and search space set Aggregation level for the serving cell corresponding to The number of PDCCH candidates configured to monitor; for any common search space, and; for a UE-specific search space, is a control resource set Search space set within CCE aggregation level All configured for Across the values It is the maximum value of; also RNTI value used for.

[0065] If the UE exhibits carrier aggregation capability greater than 4 serving cells, the number of DL cells capable of monitoring non-overlapping CCEs per slot and the maximum number of PDCCH candidates when the UE is configured for carrier aggregation operations for more than 4 cells. UE represents.

[0066] SCS configuration on UE DL BWPs having If downlink cells are configured (here, ), UE, in the active DL BWP of the scheduling cell, per slot for each scheduled cell More non-overlapping CCEs or There is no need to monitor more PDCCH candidates, and here and Each UE is an SCS configuration This is the maximum number of PDCCH candidates and the maximum number of non-overlapping CCEs that can be monitored / processed per slot.

[0067] SCS configuration on UE DL BWPs having Downlink cells are configured (here, ), if the DL BWP of the active cell is the active DL BWP of the active cell, and the DL BWP of the inactive cell is a DL BWP having an index provided by the upper layers for the inactive cell, then the UE per slot from the active DL BWP(s) of the scheduling cell(s) of the downlink cells More non-overlapping CCEs or There is no need to monitor more PDCCH candidates.

[0068] A PUCCH can be transmitted according to one of several PUCCH formats. Because different UCI payloads require different PUCCH transmission structures to improve the associated UCI BLER, a PUCCH format corresponds to a structure designed for a specific range of UCI payloads. A PUCCH transmission is also associated with a Transmission Configuration Indicator (TCI) state that provides a spatial domain filter for the PUCCH transmission. A PUCCH can be used to transmit HARQ-ACK information, SR, or periodic / semi-continuous CSI, and combinations thereof.

[0069] A UE can be configured to operate as a multi-bandwidth part (BWP) in a DL system BW (DL BW) or UL system BW (UL BWP). At any given time, only one DL BWP and one UL BWP are active for the UE. Thus, DL receptions occur in the active DL BWP, and UL transmissions occur in the active UL BWP. Additionally, more than one DL BWP or UL BWP may be simultaneously active, and then more than one DL reception or UL transmission may occur simultaneously in more than one DL BWP or UL BWP, respectively. Configurations of various parameters, such as the seek space set configuration for PDCCH reception or the PUCCH resource for PUCCH transmission, may be provided individually for each BWP.

[0070] The primary purpose of BWP operation is to enable power savings for the UE. When the UE has data to transmit or receive, a large BWP can be used, for example, to configure two or more sets of search spaces with short monitoring cycles. When the UE does not have data to transmit or receive, a small BWP can be used, for example, to configure a single set of search spaces with longer monitoring cycles.

[0071] Another mechanism for UE power saving may be an operation with discontinuous reception (e.g., C-DRX operation) when the UE has an RRC connection with the serving gNB (e.g., RRC_CONNECTED mode). When the UE is in RRC_CONNECTED mode, the UE operates in C-DRX mode associated with the "on duration" and "inactivity timer" parameters. During the "on duration" period, the UE monitors PDCCH in the configured seek space sets (attempting to detect DCI format). If the UE detects a DCI format that schedules PDSCH reception or PUSCH transmission during the "on duration" period, the UE starts the "inactivity timer" and continues to monitor PDCCH until the "inactivity timer" expires and the UE enters sleep mode for power saving.

[0072] The configuration of the "On Duration" and "Inactive Timer" values ​​is determined by the serving gNB, and there is no UE feedback regarding preferred values. For example, based on the power level or power consumption for a specific carrier or BWP, the UE may suggest values ​​for "On Duration" and "Inactive Timer." For instance, a UE with low battery power may suggest a larger value for the "On Duration" period and a smaller value for the "Inactive Timer."

[0073] While most UE modem power is consumed when monitoring the PDCCH depending on the data traffic application, the UE fails to detect the DCI format during many C-DRX periods; even in C-DRX periods where the UE does detect the DCI format, the inactivity timer expires without the UE detecting a different DCI format. For this reason, instead of the UE automatically doing so at the start of each C-DRX period, stopping PDCCH monitoring until the next C-DRX period begins, or until the UE detects the corresponding WUS, the UE is indicated to wake up the PDCCH and begin monitoring by considering the use of WUS (wake-up signaling) or GTS (go-to-sleep) signaling, respectively.

[0074] For certain frequency bands, the UE must support operation with four receiver antennas. Such a large number of receiver antennas increases UE power consumption and may be unnecessary or undesirable when the UE receives small data packets, when the UE is in good coverage, or when the UE's battery power is low. Directly or indirectly, the UE's recommendation for a desirable number of receiver antennas can also promote reduced UE power consumption.

[0075] Similar to the adaptation of the number of UE receiver antennas, the number of active secondary cells (SCells) for a UE can be adapted based on the buffer state for the UE. While existing networks support the activation / deactivation of SCells via MAC layer signaling, physical delays are often required for CSI measurements and feedback, particularly after a SCell is activated. For this reason, this feature is frequently not utilized by serving gNBs, as there is no incentive for the gNB to deactivate (and subsequently activate) SCells. Instead, the serving gNB generally maintains the SCells configured for an active UE even when there is no data in the buffer for transmission to the UE.

[0076] Cross-slot scheduling of PDSCH reception or PUSCH transmission is also considered to enable UE power saving. The UE may perform a light sleep during a period (denoted as K0 / K2, respectively) represented by the delay between the scheduled PDCCH and the scheduled PDSCH / PUSCH reception / transmission. However, the power saving period is limited by the start of the next PDCCH monitoring occation. The UE may switch from light sleep mode to normal active mode as long as the next PDCCH monitoring occation starts, regardless of whether the timer associated with the current K0 / K2 expires.

[0077] NR supports semi-static (Type-1) and dynamic (Type-2) HARQ-ACK codebook determination, whereby the UE provides HARQ-ACK information for a series of PDSCH receive acknowledgments in a single PUCCH or PUSCH transmit. This enables the UE to save power by reducing the number of PUCCH transmits required to provide HARQ-ACK information and, in the case of unpaired spectrum operation, reduces the overhead for switching between receives in the DL and transmits in the UL. For a semi-static HARQ-ACK codebook, the UE determines the HARQ-ACK codebook size by a set of slot timing values ​​K1 for PUCCH transmits containing HARQ-ACK information. For DCI format 1_1, the UE, dl_DataTo_UL_ACK A set of slot timing values ​​K1 can be provided by upper-level parameters such as.

[0078] For example, a slot timing value set K1 may contain eight elements with values ​​ranging from 0 to 15 or 31. However, the semi-static configuration of slot timing values ​​may not be efficient for adapting to different data traffic loads. Additionally, UE power saving gains are not balanced across different numerologies. For instance, when using the same configuration for slot timing values, a UE operating in frequency range 2 (FR2 – carrier frequencies above 6 GHz) requires more power than a UE operating in frequency range 1 (FR1 – carrier frequencies below 6 GHz). This is due to the more frequent transmission of HARQ-ACK information and increased overhead for the transition from DL to UL in the case of non-pairing spectrum operation, such as in FR2.

[0079] To reduce the number of non-overlapping CCEs occupied by PDCCH candidates, a nested search space determined according to a search space determination such as Equation 1 may be used. For example, in the case of a nested search space, the search space for predetermined PDCCH candidates may be determined according to Equation 1, and the search space for the remaining PDCCH candidates may include only the CCEs of the predetermined PDCCH candidates using Equation 1 or some other structure.

[0080] For example, the predetermined PDCCH candidates may be the PDCCH candidates with the largest (non-zero) CCE aggregation level. For example, the predetermined PDCCH candidates may be those requiring the largest number of CCEs, for example, 4 PDCCH candidates with an aggregation level of 4 CCEs require 16 CCEs, which is more than the 8 CCEs required by 1 PDCCH candidate with an aggregation level of 1 CCE.

[0081] The trade-off between the nested search space and the search space according to Equation 1 is that the former reduces the number of non-overlapping CCEs, while the latter reduces the blocking probability for PDCCH transmissions. Therefore, it is necessary to allow the gNB to adjust the search space selection for the UE depending on whether the gNB prioritizes the former part of the trade-off for the UE or the latter part, and even to allow the gNB to apply both parts of the trade-off.

[0082] Therefore, there is a need to indicate to the UE whether to monitor PDCCH candidates during multiple C-DRX periods or during multiple PDCCH monitoring OKs within a C-DRX period.

[0083] There is another need to provide the UE with a means to indicate the serving gNB preference configuration for transmission and reception.

[0084] There is another need to enable the UE to perform fast SCell activation and deactivation.

[0085] There is another need to design a new mode of operation for communication between the UE and the serving gNB that enables UE power savings without penalizing network operation.

[0086] There is another need to adapt the slot timing value set K1 for both semi-static and dynamic HARQ-ACK codebook decisions for multiple active SCells and corresponding subcarrier interval configurations.

[0087] There is another need for MN, SN, and UE to have the same understanding of the number of PDCCH candidates expected to be monitored by the UE per slot and the number of non-overlapping CCEs for which channel estimation is expected to be performed by the UE per slot.

[0088] Finally, there is a need to set the processing time for scheduling PDSCH / PUSCH and combine the activation / deactivation of secondary carriers with dynamic adaptation to the processing time for scheduling.

[0089] The present disclosure covers 4G (4) such as LTE (Long Term Evolution). thThis disclosure relates to pre-5G or 5G communication systems provided to support higher data rates beyond the -generation) communication system. This disclosure relates to indicating to a UE whether to monitor PDCCH candidates during a C-DRX period or during PDCCH monitoring approval within a C-DRX period. This disclosure also relates to providing a UE with means to indicate a preferred configuration for a serving gNB for transmission and reception. This disclosure also relates to enabling a UE to perform rapid SCell activation and deactivation. This disclosure also relates to designing a new mode of operation for communication between a UE and a serving gNB that enables UE power savings without penalizing network operation.

[0090] The present disclosure also relates to adapting a set of slot timing values ​​K1 for both semi-static and dynamic HARQ-ACK codebook determinations for multiple active SCells and corresponding subcarrier interval configurations. The present disclosure also relates to establishing a common understanding among the MN, SN, and UE regarding the number of PDCCH candidates expected to be monitored per slot by the UE and the number of non-overlapping CCEs expected to be able to perform channel estimation per slot by the UE. The present disclosure also relates to setting a processing time for scheduling PDSCH / PUSCH and combining the activation / deactivation of secondary carriers with dynamic adaptation to the processing time for scheduling.

[0091] In one embodiment, a signaling design is provided to indicate to the UE to skip PDCCH monitoring during a plurality of C-DRX cycles, skip PDCCH monitoring within a C-DRX cycle, or adjust parameters for a plurality of C-DRX cycles.

[0092] Indications regarding the coordination of the number of configured PDCCH candidates monitored by the UE in a set of search spaces may be provided by the DCI format. The DCI format may be decoded by multiple UEs (UE common DCI format) from PDCCHs received in a common search space, or it may be UE-specific from PDCCHs received in a UE-specific search space. We will now describe improvements to the structure of the DCI format and the content of the information provided regarding PDCCH monitoring by the UE.

[0093] In the case of a common DCI format for the UE, the UE is configured with a location for the DCI format, for example, an RNTI referred to as PS-RNTI, and a field containing a continuous number of bits in the DCI format. The UE may be configured with a single location / field corresponding to a single cell or group of cells that can be represented by, for example, upper layers, or multiple locations / fields corresponding to each multiple cell or group of multiple cells. For simplification, the DCI format is referred to as DCI format P.

[0094] For the indication of PDCCH monitoring per C-DRX period for the UE, the UE monitors PDCCH for DCI format P at one or more times / OKs provided by upper layers only when the C-DRX period starts or before the C-DRX period starts (e.g., 1 msec before the C-DRX period starts), thereby providing the UE with sufficient processing time to apply indication by DCI format P at the start of the C-DRX period and potentially performing CSI-RS measurements before the start of the C-DRX period to provide CSI reporting.

[0095] One or two CCE aggregation levels may be configured in the UE to monitor PDCCHs having DCI format P, or to reduce the number of decoding tasks, facilitate decoding of DCI format P, and minimize associated UE power consumption, and the number of PDCCH candidates per CCE aggregation level may be configured up to a predetermined maximum number, such as 2 or 4, or may be defined in the system operation. One or two CCE aggregation levels for PDCCHs containing DCI format P may also be defined in the system operation.

[0096] The number of bits in the field (UE-specific DCI format or UE common DCI format) may be one or more. For 1 bit, this indication may be whether the UE will skip PDCCH monitoring in multiple C-DRX periods or in the next C-DRX period, which the UE is provided in advance by the upper layer signaling. For example, a value of "0" may indicate skipping PDCCH monitoring, and a value of "1" may indicate PDCCH monitoring in the next C-DRX period.

[0097] In the case of multiple bits, in one embodiment, this indication may include adjustments to the parameters of the C-DRX period by indicating values ​​for the "on-duration" parameter and the "inactive timer" parameter from a corresponding set of values ​​provided in advance by the upper layers to the UE. This indication may also include adjustments to the number of PDCCH candidates configured to be monitored by the UE to detect the DCI format scheduling PDSCH reception or PUSCH transmission.

[0098] For example, in the case of 2 bits, a value of "00" may indicate to the UE to skip PDCCH monitoring during the next C-DRX period, and values ​​of "01", "10", or "11" may indicate a set of first, second, and third "on-duration, inactive timer" values, respectively, where the set of "on-duration, inactive timer" values ​​is provided to the UE in advance by the upper layers.

[0099] In another embodiment, this indication may be the number of slots in the C-DRX period from a set of slot numbers for which the UE skips PDCCH monitoring, which is provided to the UE in advance by upper-layer signaling or defined in system operation. For example, in the case of 2 bits, a "00" value may indicate to the UE to monitor PDCCH in all slots of the C-DRX period (i.e., not skip PDCCH monitoring), and "01", "10", or "11" values ​​may respectively indicate to the UE to skip PDCCH monitoring for slots N1, N2, or N3, where the values ​​of N1, N2, and N3 are provided to the UE by the upper layers.

[0100] For example, in the case of a DCI format P receive cycle of N slots and 2 bits, a value of "00" may indicate to the UE to monitor PDCCH in all slots of the C-DRX period (i.e., not skip PDCCH monitoring), and a value of "01," "10," or "11" may indicate to the UE to skip PDCCH monitoring in every 4th slot of the next N slots (including or excluding the slot of DCI format P reception), in every 2nd slot of the next N slots, or in all next N slots, respectively, where N may be provided to the UE by upper layers or may include all remaining slots within the C-DRX period. Even in the case of PDCCH monitoring occations where the UE skips PDCCH monitoring, the UE still increments the inactive timer.

[0101] The UE may also receive a period for receiving DCI format P configured by the upper layer, and the UE applies this configuration to a set of "on-duration, inactivity timer" values ​​for all C-DRX periods up to the C-DRX period corresponding to the next reception of DCI format P. If the UE fails to detect DCI format P in the corresponding monitoring occupant, the UE assumes the maximum values ​​among the configured values ​​for the on-duration and inactivity timer. This ensures that the PDCCH monitoring occupants become the upper set of those indicated by DCI format P, and guarantees that the UE does not miss receiving PDCCH transmissions from the gNB.

[0102] Alternatively, the UE may assume a predetermined set of values ​​from a configured set of values, such as a first set of "on-duration, inactive timer" values, and may even enable a gNB implementation that guarantees an appropriate value, such as a maximum value, if the UE fails to detect DCI format P. In the case of cross-carrier scheduling, the same set of "on-duration, inactive timer" values ​​may be applied to each set of search spaces corresponding to each scheduled cell having the same scheduling cell.

[0103] FIG. 8 illustrates a flowchart of a method (800) for a UE to adjust parameters during a C-DRX period according to embodiments of the present disclosure. The embodiment of the method (800) illustrated in FIG. 8 is for illustrative purposes only. One or more components illustrated in FIG. 8 may be implemented as special circuits configured to perform the mentioned functions, or one or more components may be implemented by one or more processors that execute instructions to perform the mentioned functions. Other embodiments are used without departing from the scope of the present disclosure.

[0104] Using upper layer signaling, the gNB configures the UE in step 810 the location of a field in DCI format P indicating the configuration for the RNTI for DCI format P, the period for receiving DCI format P, one or more offsets for PDCCH monitoring prior to the start of the DRX cycle for DCI format P, and the configuration for the set of values ​​for the "on-duration" and "inactive timer" parameters for the C-DRX period until the next reception of DCI format P. The UE determines whether it detected DCI format P at the reception time configured in step 820. If the UE does not detect DCI format P, the UE assumes the maximum values ​​among each configured value for the set of "on-duration, inactive timer" values ​​in step 830. If the UE detects DCI format P, the UE monitors the PDCCH during the C-DRX period according to the set of "on-duration, inactive timer" values ​​indicated by the corresponding field for the UE in DCI format P in step 840. If the field indicates a predetermined value such as "00", the UE can skip PDCCH decoding for all C-DRX periods until the next monitoring OK for DCI format P.

[0105] Each set of “on-duration, inactive timer” values ​​can be configured to be associated with a set of seek space sets that the UE is pre-configured by upper layers. For example, the UE can be configured to monitor up to four seek space sets during a C-DRX period for PDCCH receptions that transmit UE-specific DCI formats, and the first, second, and third sets of “on-duration, inactive timer” values ​​can be associated, respectively, with the first, second, and third subsets of the set of seek space sets by upper layer signaling.

[0106] For example, a first set of "on duration, inactive timer" values ​​can be associated with the first two sets of search spaces (in configuration order), a second set of "on duration, inactive timer" values ​​can be associated with the first three sets of search spaces, and a third set of "on duration, inactive timer" values ​​can be associated with all four sets of search spaces.

[0107] Each set of “on-duration, inactive timer” values ​​may be configured to be associated with a percentage (or ratio) of PDCCH candidates that the UE is pre-configured by the upper layers. For example, the UE may be configured to monitor PDCCH candidates for scheduling PDSCH reception or PUSCH transmission in multiple seek space sets within a C-DRX period. The first, second, and third sets of “on-duration, inactive timer” values ​​may be associated with the first, second, and third percentages of the number of PDCCH candidates for each CCE aggregation level per seek space set, respectively, by upper layer signaling, where if the percentage is not an integer number of PDCCH candidates for each CCE aggregation level of the seek space set, a floor function or a ceiling function may be applied.

[0108] For example, a first set of "on duration, inactive timer" values ​​may be associated with all PDCCH candidates per CCE aggregation level in each search space set, a second set of "on duration, inactive timer" values ​​may be associated with 2 / 3 of the PDCCH candidates per CCE aggregation level in each search space set, and a third set of "on duration, inactive timer" values ​​may be associated with 1 / 3 of the PDCCH candidates per CCE aggregation level in each search space set.

[0109] Except for the first value, which can always be 1, the ratios may be configured by the upper layers instead of being predetermined as in the previous example. Alternatively, instead of the first, second, and third sets of "on-duration, inactive timer" values ​​associated with the respective first, second, and third ratios of PDCCH candidates for each CCE aggregation level per search space set, three separate configurations of PDCCH candidates for each CCE aggregation level per search space set may be provided and associated with three corresponding sets of "on-duration, inactive timer" values.

[0110] If the UE does not detect a DCI format P in the corresponding PDCCH monitoring OK, the UE monitors the PDCCH during the corresponding C-DRX period according to default settings according to the first configuration, such as a configuration with a maximum number of candidates per CCE aggregation level and per search space set (or a configuration corresponding to a ratio value of 1) for the number of PDCCH candidates per CCE aggregation level for each search space set.

[0111] FIG. 9 illustrates a flowchart of a method (900) in which a UE adjusts the number of PDCCH candidates per CCE aggregation level and per search space set according to embodiments of the present disclosure. The embodiment of the method (900) illustrated in FIG. 9 is for illustrative purposes only. One or more components illustrated in FIG. 9 may be implemented as special circuits configured to perform the mentioned functions, or one or more components may be implemented by one or more processors executing instructions to perform the mentioned functions. Other embodiments are used without departing from the scope of the present disclosure.

[0112] Using upper layer signaling, the gNB configures the association between each set of "on-duration, inactive timer" values ​​and the PDCCH candidate ratio for each configured number of PDCCH candidates per CCE aggregation level for each search space set in step 910 in the UE.

[0113] In step 920, the UE determines whether it detects DCI format P at the configured reception time. If the UE does not detect DCI format P, the UE assumes the number of PDCCH candidates configured per CCE aggregation level for each set of search spaces in step 930. If the UE detects DCI format P, the UE determines a set of "on-duration, inactive timer" values ​​as described, for example, in FIG. 8, and based on the corresponding association with the ratio of PDCCH candidates, the UE determines the number of PDCCH candidates per CCE aggregation level for each set of search spaces in step 940.

[0114] To minimize overhead associated with DCI format P or to increase the number of UEs that DCI format P can process or the amount of information that DCI format P can provide, the CRC length for DCI format P may be smaller than the CRC length for other DCI formats, such as DCI formats that schedule PDSCH reception or PUSCH transmission.

[0115] For example, the CRC length for DCI format P can be 8 bits or 16 bits, whereas the CRC length for other DCI formats can be 24 bits. If the serving gNB does not transmit DCI format P and the UE incorrectly detects DCI format P due to an incorrect CRC check, the worst-case result is that the UE may not monitor PDCCH during the C-DRX period, which the serving gNB expects the UE to monitor PDCCH, and this can be realized through DTX detection of PUCCH, which conveys the corresponding HARQ-ACK information when the gNB schedules PDSCH reception to the UE, or through DTX detection of PUSCH reception when the gNB schedules PUSCH transmission to the UE.

[0116] If the UE is configured to operate with carrier aggregation, the UE may be configured with a number of fields in DCI format P equal to the number of corresponding cells or cell groups, and the previously described functions of DCI format P for single-cell operation may be parallelized for the number of fields corresponding to the number of cells or cell groups in an operation using carrier aggregation. Cells within a cell group may be pre-configured by upper layers or implicitly determined by the cell index and the number of cells within the cell group.

[0117] Adaptation of the set of "on-duration, inactive timer" values ​​for the C-DRX cycle may also depend on the DL BWP used for reception by the UE. For example, the configuration of the set of "on-duration, inactive timer" values ​​may be provided for each BWP, or independently for the first BWP and the remaining BWPs.

[0118] For example, smaller values ​​for "on duration" and "inactivity timer" can be configured in a first DL BWP used when the gNB does not have a large amount of data in the gNB buffer for the UE and does not require high data rates, and larger values ​​for "on duration" and "inactivity timer" can be configured in a second DL BWP used when the gNB wants to achieve high data rates for the UE.

[0119] FIG. 10 illustrates a flowchart of a method (1000) for determining the number of PDCCH candidates per CCE aggregation level and per search space set, depending on the corresponding DL BWP according to embodiments of the present disclosure. The embodiment of the method (1000) illustrated in FIG. 10 is for illustrative purposes only. One or more components illustrated in FIG. 10 may be implemented as special circuits configured to perform the mentioned functions, or one or more components may be implemented by one or more processors executing instructions to perform the mentioned functions. Other embodiments are used without departing from the scope of the present disclosure.

[0120] In step 1010, the gNB uses upper-layer signaling to configure a first value for "on-duration" and a first value for "inactive timer" related to the C-DRX period of the first DL BWP, and a second value for "on-duration" and a second value for "inactive timer" related to the C-DRX period of the second DL BWP. In step 1020, the UE determines whether the activated DL BWP is the first DL BWP or the second DL BWP. If the activated DL BWP is the first DL BWP, the UE uses the first values ​​for the "on-duration" and "inactive timer" parameters for the C-DRX period in step 1030. If the activated DL BWP is the second DL BWP, the UE uses the second values ​​for the "on-duration" and "inactive timer" parameters for the C-DRX period in step 1040.

[0121] Indication by DCI format P (which may be UE common or UE specific, such as DCI format 0_1 ​​or DCI format 1_1) may not apply in slots or PDCCH monitoring occupants where the UE also monitors PDCCH in the common search space, because the UE must activate its radio frequency and decode at least one DCI format. This may be further limited to common search spaces corresponding to DCI formats that schedule PDSCH reception, such as DCI formats using a CRC scrambled by SI-RNTI or RA-RNTI or P-RNTI, and in DCI formats that do not schedule PDSCH reception, such as DCI formats using a CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI or SFI-RNTI, power can continue to be saved because the UE does not need to prepare for PDSCH reception. Therefore, the UE can decode UE-specific DCI formats at least in PDCCH monitoring occupants or in slots that decode the UE common DCI format for which the UE schedules PDSCH reception.

[0122] Dynamic activation of secondary cells

[0123] The primary latency source for activating secondary cells is related to the delay in which the UE provides CSI feedback to the serving gNB for the secondary cells. Additionally, this CSI feedback may indicate channel quality that is insufficient for the gNB to schedule PDSCH transmits to the UE from the secondary cells. Subsequently, additional latency is required for the gNB to activate another set of secondary cells for the UE, obtain the corresponding CSI feedback, and deactivate cells that are not associated with sufficiently good CSI feedback.

[0124] To prevent these latency issues when activating secondary cells, LTE operations introduced a new SCell state (so-called sleep state), in which the UE can measure and report periodic CSI feedback for the SCell; this new SCell state is equivalent to the disabled state, and the UE does not monitor the PDCCH for the corresponding SCell or transmit / receive other signaling. However, unlike LTE, where a CRS or periodic CSI-RS exists per subframe to enable periodic CSI measurements at predetermined time instances, the new radio system may not have a CRS or periodic CSI-RS. In that case, for the UE to measure the CSI and provide a CSI report to the gNB, the UE must be signaled with a non-zero power CSI-RS (NZP CSI-RS) configuration for the corresponding disabled SCell.

[0125] For simplification, the UE may receive CSI-RS-RNTI configured by upper layers for scrambling the CRC of the DCI format, referred to as DCI format C. The UE also receives one or more locations for each field of DCI format C configured by upper layers, where each field corresponds to a SCell or SCell group, and each SCell index or each SCell index of a SCell group is configured by upper layers.

[0126] This field is used to indicate the NZP CSI-RS resource configuration for NZP CSI-RS reception by the UE in the corresponding SCell or SCell group, which may include all configured cells or all inactive cells. NZP CSI-RS reception is used by the UE to measure and report CSI for the SCell or SCell group.

[0127] This field is ceil(log2(n NZPIt can contain the same number of bits as +1), where ceil() is a shilling function that rounds a number to the next largest integer, and n NZP is the number of NZP CSI-RS resource configurations that can be represented in DCI format C for a SCell. For example, if the NZP CSI-RS resource configuration is limited to 1, the field in DCI format C includes 1 bit, for example, where a value of "0" indicates that there is no NZP CSI-RS reception for the SCell (or SCell group) and therefore no CSI measurement or reporting, and a value of "1" indicates NZP CSI-RS reception for the SCell.

[0128] UE T It can receive simultaneously through cells and the UE A If the UE has active cells, T-A Cells can simultaneously receive NZP CSI-RS. The number of cells displayed to the UE by DCI format C for NZP CSI-RS reception is T-A If it is not larger, the UE can simultaneously receive NZP CSI-RS from SCells that are displayed according to each NZP CSI-RS resource configuration.

[0129] For example, NZP CSI-RS reception can be performed through the same symbols in the same slot. The number of SCells displayed to the UE by DCI format C for NZP CSI-RS reception is T-A If greater than, the UE, according to each cell index and each NZP CSI-RS resource configuration, the first T-A Receive NZP CSI-RS simultaneously from SCells, and then T-A SCells can be continued and others like this. If the UE cannot receive NZP CSI-RS simultaneously on all indicated SCells and the UE needs to re-tune its radio frequency, successive T-A NZP CSI-RS reception in SCells may occur in different consecutive slots that support ZP CSI-RS reception (e.g., non-uplink slots). The DL BWP for NZP CSI-RS reception in a disabled cell may be a reference DL BWP, such as the initial DL BWP indicated by the upper layers for each SCell.

[0130] DCI format C may also include PUCCH resources for the UE to transmit associated CSI reports in PUCCH (including slot time offsets for slots for receiving in DCI format C) and TPC commands to adjust the transmit power of PUCCH.

[0131] FIG. 11 illustrates a flowchart of a method (1100) for a UE to measure and report CSI for a cell set according to embodiments of the present disclosure. The embodiment of the method (1100) illustrated in FIG. 11 is for illustrative purposes only. One or more components illustrated in FIG. 11 may be implemented as special circuits configured to perform the mentioned functions, or one or more components may be implemented by one or more processors that execute instructions to perform the mentioned functions. Other embodiments are used without departing from the scope of the present disclosure.

[0132] In step 1410, the gNB configures the UE with a field location in DCI format C representing an RNTI for DCI format C, a seek space set including a period for receiving DCI format C, and a configuration for NZP-CSI-RS receiving or a single configuration pre-provided by upper layer signaling, or a configuration for enabling CSI-RS receiving. In addition to enabling CSI-RS receiving, this field or each additional field may include a TPC command for determining power for PUCCH transmission including one or more CSI reports, a corresponding PUCCH resource, and a slot timing offset, unless they are pre-configured or specified by upper layers.

[0133] Enabling CSI reception may be performed for all cells, or only for unenabled cells, or only for a group of cells comprising one or more cells and configured by upper layers. Upon detection of DCI format C, the UE determines in step 1420 whether the corresponding field indicates CSI-RS reception enabling for the cell. If so, the UE performs a measurement based on CSI-RS in step 1430, acquires the CSI, and reports the CSI for the cells applicable in the PUCCH transmitted by the UE at a power determined using the TPC command, the indicated PUCCH resource, and the slot timing offset.

[0134] Preferred configuration report

[0135] The UE may report one or more configurations for transmitting to or receiving from a serving gNB preferred by the UE, for example, depending on the power state of the UE. For example, when the UE has full battery power or is connected to a power supply, the UE may request a first configuration that may be advantageous, for example, for increased coverage or data rate. For example, when the UE has low battery power, the UE may request a second configuration that may prioritize, for example, reducing UE power consumption over increasing the data rate. Parameters of one configuration may include the number of transmitter antennas or spatial layers, the number of receiver antennas or spatial layers, the number of active cells, the PDCCH monitoring cycle, etc.

[0136] Each of the one or more configurations that the UE reports to the serving gNB can be represented by the value of a field. For example, using a 2-bit field with the values ​​"00", "01", "10", and "11", one of the following four configurations can be represented: {2 receiver antennas, 1 spatial layer, 1 group of active cells}, {4 receiver antennas, 2 spatial layers, 1 group of active cells}, {4 receiver antennas, 2 spatial layers, 2 group of active cells}, and {2 receiver antennas, 2 spatial layers, 3 group of active cells}.

[0137] The number of preferred configurations that a UE can report can be predetermined in system behavior, such as a single configuration, or configured in the UE by higher layers. If a UE is configured to report two or more preferred configurations, the order of preference may follow the order of the corresponding fields in the report. Reporting of one or more preferred UE configurations may be periodic or triggered by the UE or gNB.

[0138] For periodic reporting, the UE may be configured with a PUCCH resource for the transmission of a PUCCH containing the reporting period and the report. Periodic reporting of the preferred configuration may correspond to periodic / semi-continuous CSI reporting, even if the period is the same or shorter, and the UE may combine the two reports in the same PUCCH. If the number of REs available in the PUCCH resource (excluding REs used for DMRS transmission) is insufficient for the control information in each PUCCH transmission, for example, if the UE cannot achieve the target code rate configured by the upper layers, the UE may prioritize the transmission of the configuration report over the transmission of the CSI report.

[0139] In the case of a triggered report, the UE may include the report in the MAC control element (MAC CE) that it transmits on PUSCH. This also enables the serving gNB to determine whether the report has been correctly received (by performing a CRC check on the reception of the relevant transmission block). The report may also be requested by the serving gNB through a field in DCI format, such as DCI format 0_1 ​​or DCI format 1_1, for example.

[0140] The serving gNB can indicate the configuration selected for the UE by the MAC CE during PDSCH transmission to the UE. This configuration may be applied after a specific period determined by the time required for the UE to apply the new configuration. For example, this time may be the same as the time required for the UE to apply the new TCI state indicated by the MAC CE. If the UE uses a configuration with a reduced number of receiver antennas, the UE may be switched to use the maximum number of receiver antennas, such as four, to ensure that the UE does not go out of coverage due to sudden changes in coverage, and the cycle may be configured for the UE by the upper layers from the serving gNB. For example, at one or more slots per slot, such as 40 slots or every 40 ms, the UE may enable all receiver antennas and then disable some receiver antennas based on the configuration indicated by the serving gNB. The number of slots may be configured for the UE by the upper layers or defined in the NR specifications of the system operation.

[0141] For example, because different receiver antennas may experience different path losses due to external factors such as UE design or UE placement / orientation, or due to human blocking or other interference with the received signal, the UE provides the gNB with CQI or SINR / RSRP for each receiver antenna or for each subset of receiver antennas. This report may be for a reference cell, such as a PCell, or for any cell where the UE reports CQI or RSRP. For example, this report may include the RSRP for a first receiver antenna, such as the antenna with the largest RSRP, and the differential RSRP of the remaining receiver antennas, for example, in quantized steps of 3 dB. For example, this report may include CQI for four receiver antennas, CQI for two receiver antennas, or CQI for one receiver antenna. This may provide the serving gNB with additional information to determine the configuration regarding the number of the UE's receiver antennas (and transmitter antennas).

[0142] For example, if the RSRP for the second antenna is at least 6 dB lower than the RSRP for the first antenna, the gNB may indicate to the UE to disable the second receiver antenna. If the UE determines that the RSRP for one receiver antenna is below a predetermined threshold compared to the RSRP of the other receiver antenna, it is also possible for the UE to make such a decision independently without notifying the gNB.

[0143] FIG. 12 illustrates a flowchart of a method (1200) for a UE report to determine the configuration of the number of UE receiver antennas according to embodiments of the present disclosure. The embodiment of the method (1200) illustrated in FIG. 12 is for illustrative purposes only. One or more components illustrated in FIG. 12 may be implemented as special circuits configured to perform the mentioned functions, or one or more components may be implemented by one or more processors executing instructions to perform the mentioned functions. Other embodiments are used without departing from the scope of the present disclosure.

[0144] The UE is equipped with N receiver antennas. In step 1210, the UE measures reception quality, such as RSRP or CQI, for each of the N receiver antennas or for a group of N receiver antennas. In step 1220, the UE reports the RSRP or CQI for the N receiver antennas or the group of N receiver antennas to the gNB. In step 1230, the UE receives from the gNB a configuration of the number of receiver antennas or a group of receiver antennas for the UE to receive a transmission from the gNB. If this configuration provides a number of receiver antennas, the receiver antennas are those that have the same number and a larger reported RSRP.

[0145] The configuration may also be implicitly determined by the UE based on operating conditions. For example, when the UE switches from a first BWP, such as a default BWP or an initial BWP, to a second BWP, the UE may also switch from the first configuration to the second configuration. A BWP may be associated with any active cell or with the primary cell only. For example, the UE may operate with four receiver antennas if the DL BWP is a first DL BWP, such as a large DL BWP that supports a high data rate, and may operate with two receiver antennas if the DL BWP is a second DL BWP, such as a small DL BWP that supports the transmission of small data packets to the UE. Such UE operation may be enabled by the serving gNB through individual configurations by the upper layers.

[0146] FIG. 13 illustrates a flowchart of a method (1300) for determining the number of UE receiver antennas dependent on a corresponding DL BWP according to embodiments of the present disclosure. The embodiment of the method (1300) illustrated in FIG. 13 is for illustrative purposes only. One or more components illustrated in FIG. 13 may be implemented as special circuits configured to perform the mentioned functions, or one or more components may be implemented by one or more processors executing instructions to perform the mentioned functions. Other embodiments are used without departing from the scope of the present disclosure.

[0147] As illustrated in FIG. 13, in step 1310, the UE receives a configuration for the number of first receiver antennas if the first DL BWP is an activated DL BWP, and receives a configuration for the number of second receiver antennas if the second DL BWP is an activated DL BWP. In step 1320, the UE determines whether the activated DL BWP is a first downlink BWP or a second DL BWP. If the activated DL BWP is a first DL BWP, the UE uses a first number of receiver antennas in step 1330. If the activated DL BWP is a second downlink BWP, the UE uses a second number of receiver antennas in step 1340. The UE may further select the first and second numbers to correspond to receiver antennas that measure a larger RSRP.

[0148] The gNB can provide adaptations to the transmit / receive configuration by the UE using higher-layer signaling, such as MAC CE or RRC, or Layer 1 (physical layer) signaling. The latter is preferred when minimum latency for configuration adaptation is critical to obtaining most of the gain from that adaptation. If the number of bits required to provide adaptations to the transmit / receive configuration by the UE is not small or if adaptations are infrequent, reinterpreting a UE-specific DCI format to represent the adaptation may be a more efficient choice than using one or more fields in the UE common DCI format or the UE-specific DCI format. This is because, if the actual use of such fields is infrequent, fields can be transmitted to the UE by the gNB upon request, rather than always reserving fields in the UE common DCI format or the UE-specific DCI format to represent the adaptation of the configuration for the UE.

[0149] Reinterpretation of the UE-specific DCI format to indicate configuration adaptation for the UE, instead of scheduling PDSCH reception or PUSCH transmission, can be achieved by an explicit 1-bit field or by setting existing fields of the UE-specific DCI format to specific values. For example, in DCI format 0_1, a field indicating no UL-SCH (Uplink Shared Channel) transmission may be set (no UL-SCH), and a field indicating an A-CSI report request may not be set (no A-CSI report).

[0150] For example, the field indicating the RV (redundancy version) may be set to indicate RV 3 or RV 1, and the field indicating the transmission of the NDI (new transport block) may be set to indicate a new transport block. When the DCI format is interpreted to convey an adaptation of the configuration for the transmit / receive parameters for the UE, the adaptation may be indicated using the remaining bits of the DCI format (other than the bits used for interpretation and the CRC bits), and if the adaptation can be indicated with fewer bits than the remaining bits of the DCI format, some bits are reserved or unused.

[0151] The adapted configuration may include the number of receiver antennas, the number of transmitter antennas, the number of layers, the number of active cells or BWPs, parameters for the C-DRX period (on-duration and inactivity timer), parameters for PDCCH monitoring, and other parameters related to the configuration of the search space set, such as the scaling of PDCCH candidates. The adaptation of the configuration may be immediately effective or may be effective after a predetermined time from the point in time when the UE provides HARQ-ACK information in response to DCI format detection.

[0152] Fallback behavior to recover from potential errors may be provided by upper layers, or default at predetermined or configured time intervals (e.g., every 40 msec), or may be supported by the UE using a configuration for sending / receiving when the UE monitors UE-specific DCI formats in the common search space, etc.

[0153] Processing times (e.g., N0 / N2 symbols) associated with PDSCH / PUSCH receive / transmit scheduling can be set. N0 or N2 represent the minimum processing time required for the UE to receive PDSCH or transmit PUSCH, respectively. The delay between the PDCCH and the associated PDSCH / PUSCH receive / transmit (i.e., K1 / K2) must be greater than N0 / N2. Default values ​​for N0 / N2 may be predefined in system operation or provided to the UE via upper-layer signaling. For example, the default value for N0 / N2 may be one slot. To conserve power, the UE may enter a light sleep state for a period not greater than N0 / N2 after detecting the corresponding DCI format on the PDCCH.

[0154] To improve UE power saving gains, the serving gNB may transmit UE control information indicating dynamic updates of N0 / N2 to adapt to different power saving gain targets or different latency requirements. For example, if the control information is 1 bit, "0" may represent twice N0 / N2 compared to predetermined values, such as N0 = 2 x N0_default or N2 = 2 x N0_default, and "1" may represent N0 = max(N0 / 2, N0_default) or N2 = (N2 / 2, N2_default). N0_default and N2_default are values ​​of N0 and N2 provided to the UE from upper layers or predetermined in system operation.

[0155] When the UE is configured to operate with CA, the activation / deactivation of SCells may be combined with adaptation to N0 / N2. If N0 / N2 is greater than the threshold T^N0 / T^N2, SCells that have no scheduled PDSCH / PUSCH incoming or outgoing calls for the UE during the PDCCH monitoring period in the scheduling cell may be deactivated. Conversely, if the UE detects a DCI format in a PDCCH received from the scheduling cell and schedules a PDSCH / PUSCH incoming or outgoing call in the SCell, the UE activates the SCell. The UE may also activate the SCell whenever the UE is triggered or configured to receive CSI-RS or send SRS from the SCell.

[0156] FIG. 14 illustrates a flowchart of a method (1400) for adapting processing times for scheduling PDSCH / PUSCH receiving / transmitting in a SCell in combination with the activation or deactivation of the SCell according to embodiments of the present disclosure. The embodiment of the method (1400) illustrated in FIG. 14 is for illustrative purposes only. One or more components illustrated in FIG. 14 may be implemented as special circuits configured to perform the mentioned functions, or one or more components may be implemented by one or more processors executing instructions to perform the mentioned functions. Other embodiments are used without departing from the scope of the present disclosure.

[0157] The default configuration for the slot timing value set K1 associated only with the primary cell and the 15KHz SCS is the parameter dl_DataTo_UL_ACK As such, it can be provided to the UE by upper layers. When serving gNB indicates to the UE to switch from an active BWP with SCS_j to an active BWP with SCS_i, the size / cardinality of K1, denoted as |K1|, can be adjusted to |K1|*(SCS_j / SCS_i), and the element range of the K1 value set [0, v_i] can be adjusted to [0, v_j]*(SCS_j / SCS_i).

[0158] The slot timing value of K1 can be adjusted to the traffic load indicated by the number of active cells. Multiple active cells can be predefined and correspond to "CA levels". For example, CA level 0 / CA level 1 / CA level 2 / CA level 3 / CA level 4, denoted as L^CA_0 / L^CA_1 / L^CA_2 / L^CA_3 / L^CA_4, can be predefined to be associated with 1 / 2 / 4 / 8 / 16 active cells, respectively. When the CA level changes from L^CA_i to L^CA_j due to the activation or deactivation of cells to adapt to different traffic loads, the size / cardinality of K1, denoted as |K1|, can be adjusted to |K1|*(L^CA_j / L^CA_i), and the element range of the K1 value set [0, v_i] can be adjusted to [0, v_j]*(L^CA_j / L^CA_i).

[0159] As illustrated in FIG. 14, at step 1410, the UE receives a configuration for the default processing time in the scheduling of PDSCH / PUSCH, N0 / N2, ​​and does not expect K1 / K2 to be greater than N0 / N2. At step 1420, the UE receives L1 control information for scaling N0 / N2. At step 1430, the UE determines that N0 / N2 > T^N0 / T^N2. If N0 / N2 > T^N0 / T^N2 at step 1430, at step 1440, the UE disables SCells not marked for PDSCH / PUSCH scheduling and enables SCells marked for PDSCH / PUSCH scheduling.

[0160] FIG. 15 illustrates a flowchart of a method (1500) for adapting a slot timing value K1 with BWP switching and SCell enabling / disabling according to embodiments of the present disclosure. The embodiment of the method (1500) illustrated in FIG. 15 is for illustrative purposes only. One or more components illustrated in FIG. 15 may be implemented as special circuits configured to perform the mentioned functions, or one or more components may be implemented by one or more processors executing instructions to perform the mentioned functions. Other embodiments are used without departing from the scope of the present disclosure.

[0161] When the UE is configured to operate in dual-connection (DC), the gNB for the master cell group (MCG) and the gNB for the secondary cell group (SCG) operate independently, and adaptation to the configuration of transmit / receive parameters for the UE is generally required in both the MCG and SCG. For example, if the MCG and SCG operate in the same frequency range, such as below 6 GHz, the UE must operate with two or four Rx antennas in both the MCG and SCG, and coordination between the MCG and SCG for multiple UE receiver antennas is required.

[0162] When PDCCH monitoring appliances are adapted in the MCG or SCG, it is advantageous to have similar adaptations in the respective SCG or MCG so that the UE monitors PDCCH in both the MCG and SCG simultaneously, or is in sleep mode in both the MCG and SCG simultaneously. For example, the MCG and SCG can exchange their respective C-DRX cycles for the UE via a backhaul link, or the MCG can display the C-DRX cycle configuration for the UE to the SCG. Additionally, it is advantageous for the MCG and SCG to configure the UE to perform measurements when the UE is in the C-DRX active time in both the MCG and SCG. For example, the MCG and SCG can exchange CSI-RS patterns via a backhaul link, or the MCG can select a CSI-RS pattern from a series of CSI-RS patterns displayed to the MCG by the SCG and display it to the SCG.

[0163] To reduce the likelihood that the UE will be power-limited during transmissions to the MCG and SCG, the MCG and SCG may exchange PUSCH, PUCCH, or SRS transmission patterns for periodic or semi-continuous PUSCH, PUCCH, or SRS transmissions over a backhaul link. Then, if there is a high likelihood that the UE will be power-limited during transmissions to the MCG and SCG, such as when the UE reports a small RSRP (large path loss) to at least one CG, the SCG (or MCG) may select a pattern for periodic or semi-continuous PUSCH, PUCCH, or SRS transmissions that does not temporally overlap with the corresponding pattern on the MCG.

[0164] Conversely, if there is a small possibility that the UE may be power-limited for transmissions to the MCG and SCG, such as when the UE reports a large RSRP (small path loss) for both CGs, the SCG (or MCG) may select a pattern for periodic or semi-continuous PUSCH, PUCCH, or SRS transmissions that temporally overlap with the corresponding pattern on the MCG, and accordingly, the UE may increase the non-transmit time (excluding dynamically triggered transmissions).

[0165] If the UE provides support information related to the adaptation of transmit / receive parameters, the UE may provide individual support information to the MCG and SCG, or the UE may provide support information related to the configuration of the MCG / SCG to the SCG / MCG. In the former case, the SCG / MCG may exchange support information with the MCG / SCG via a backhaul link. If only the MCG can determine the adaptation configuration, the SCG may request the adaptation configuration from the MCG via a backhaul link. Upon request, or generally at the independent decision of the MCG, the MCG may notify the SCG of the adapted configuration.

[0166] In one example of an adaptation of a configuration for transmit / receive for a UE configured for DC operation, the MCG or SCG may signal the adaptation of the configuration to the UE and may notify the SCG or MCG, respectively, through backhaul signaling. To reduce the delay in the CG communicating with the UE using the adapted configuration, some configurations, such as the PDCCH monitoring cycle of C-DRX cycles or the configuration of parameters of the C-DRX configuration, may have a nested structure in which one configuration is a superset or subset of another configuration.

[0167] For example, the PDCCH monitoring cycle can be 0.5 msec, 1 msec, 2 msec, or 4 msec (or 1 slot, 2 slots, 4 slots, or 8 slots for a 30 kHz SCS), and regardless of adaptation, the CG knows that the UE monitors the PDCCH every 4 msec (or every 8 slots for a 30 kHz SCS). In this way, the CG can continue to schedule the UE using common values ​​for parameters for at least each configuration until the UE informs the CG that it is applying an adapted configuration. For example, if the configuration is CG-specific, such as the number of SCells, the adaptation process can be included within the CG. If the configuration is parameter-specific, such as the number of receiver antennas, the CG can make certain assumptions about the configuration applied by the UE, although a conservative assumption regarding the smallest possible number of receiver antennas may be practically justified.

[0168] In one example of an adaptation of a configuration for transmit / receive for a UE configured for DC operation, an MCG or SCG may indicate the adaptation of the configuration to the UE. To reduce the delay associated with backhaul signaling, the UE may act as a relay between two CGs and signal the adapted configuration received from one CG to the other CG.

[0169] To facilitate signaling, possible configurations may be predetermined in a configuration set by the specifications of system operation or by higher-level signaling, and the UE may signal elements from the configuration set. For example, the configuration may include the number of search space sets, parameters for each search space set, the number of receiver antennas, etc.

[0170] For example, in the case of a set with four configurations, the UE may signal 2 bits to indicate one of the four configurations. The UE may report the adapted configuration to the CG in a PUCCH transmission for the resource and slot offset indicated by the CG, or in a PUSCH transmission from the CG. To minimize PUCCH resource overhead, the adaptation of the configuration may be restricted to occur at predetermined time instances, such as every 10 msec or every 40 msec, starting from Frame 0 or a predetermined slot offset or frame offset for Slot 0 of Frame 0 provided to the UE by the upper layers.

[0171] A UE may provide additional information related to communication with another CG to a CG. For example, along with a buffer status report (BSR) for a first CG, a UE may provide a BSR for a second CG to the first CG. Since the BSR for the second CG can be used to determine the likelihood of the UE engaging in active communication with the second CG, the first CG may use the information from the BSR for the second CG to determine the adaptation of the configuration for sending and receiving from the UE. Additionally, the BSR for the UE may be exchanged between the MN and the SN via a backhaul link.

[0172] For example, along with RSRP reports for each receiver antenna for reception in the first CG, the UE may provide RSRP reports for each receiver antenna for reception in the second CG to the first CG. The first CG may use the information from the RSRP reports for the second CG to determine adaptations regarding the number of receiver antennas.

[0173] For operation by DC, the MCG monitors the maximum number of PDCCH candidates per slot via backhaul signaling. and maximum number of non-overlapping CCEs per slot It can be displayed to the SCG. The MCG can also display to the UE the maximum number of PDCCH candidates monitored per slot and the maximum number of non-overlapping CCEs per slot for the SCG, and the UE can specify the corresponding maximum numbers for the MCG. and cast, and As, the difference for the total maximum number per corresponding slot and It can be derived from, or and It may also be signaled to the UE.

[0174] In one example, the MCG and SCG can provide the UE with a corresponding maximum number of PDCCH candidates monitored per slot and non-overlapping CCEs per slot. Then, the MCG can control when the UE monitors the PDCCH in the SCG and can divide the number of PDCCH candidates and non-overlapping CCEs between the MCG and SCG.

[0175] In one example, when the cells of the SCG operate in a non-paired spectrum, such as using a TDD UL / DL configuration, the MCG allocates the maximum number of monitored PDCCH candidates and non-overlapping CCEs to the SCG, and the UE can continue to use the maximum number of monitored PDCCH candidates and non-overlapping CCEs by configuring search space sets to monitor PDCCH in the MCG when a slot has a UL orientation in the cells of the SCG (this assumes that the SCG does not change the UL / DL configuration without notifying the MCG). Generally, in PDCCH monitoring occupations for cells where the corresponding CORESETs contain UL symbols, the UE can allocate the corresponding PDCCH monitoring capability to one or more other cells.

[0176] In one example, the MCG reserves the number of PDCCH candidates monitored per slot and the number of non-overlapping CCEs per slot for use in the MCG, and may allocate to the SCG the number of remaining PDCCH candidates monitored per slot for the maximum number of PDCCH candidates monitored per slot, and the number of remaining non-overlapping CCEs per slot for the maximum number of non-overlapping CCEs per slot.

[0177] FIG. 16 illustrates a call flow (1600) for an MCG and an SCG to exchange information to determine each configuration for communicating with a UE according to embodiments of the present disclosure. An embodiment of the call flow (1600) illustrated in FIG. 16 is for illustrative purposes only. One or more components illustrated in FIG. 16 may be implemented in a special circuit configured to perform the mentioned function, or one or more components may be implemented by one or more processors executing instructions to perform the mentioned function. Other embodiments are used without departing from the scope of the present disclosure.

[0178] In step 1610, the MCG configures the UE to operate with the SCG and DC, and provides the SCG with a configuration for transmission and reception by the UE at the MCG via a backhaul link. This configuration may include, for example, the number of antennas, a set of parameters for C-DRX cycles, and the total number of PDCCH candidates configured for the UE to monitor at the SCG. In step 1620, the SCG provides the MCG with the requested configuration or parameters via the backhaul link to determine the configuration for transmission and reception by the UE at the SCG. In step 1630, the MCG provides one or more sets of configurations for the SCG to use to communicate with the UE via the backhaul link. If the sets contain more than one configuration, the SCG may notify the MCG of the selected configuration in step 1640.

[0179] To operate as a DC, the MCG is controlled by the master node (MN), and the SCG is controlled by the secondary node (SN). When the UE is configured as a DC, the MN, SN, and UE must have the same understanding of the number of PDCCH candidates the UE is expected to monitor per slot and the number of non-overlapping CCEs the UE is expected to perform channel estimation on per slot.

[0180] The first approach is that MN and SN are between them It is dividing, and here The ability of is used by MN, The ability of is used by SN ( This example is It requires backhaul signaling from MN to SN and upper-layer signaling to UE for the value of (then, ). The value of, for example To enable this, it may also be included separately in upper-level signaling.

[0181] Then, on MN On cells and SN For the UE's ability to monitor PDCCH for cells (in active BWPs), the UE configures the SCS. MN's having Total for DCI formats with different sizes and / or different corresponding DM-RS scrambling sequences per slot through cells It is expected that PDCCH candidates will be monitored.

[0182] UE is SCS configuration SN having Total for DCI formats with different sizes and / or different corresponding DM-RS scrambling sequences per slot through cells It is expected that PDCCH candidates will be monitored.

[0183] Similarly, the UE is an SCS configuration MN having Total for PDCCH reception scheduling through cells It is expected that non-overlapping CCEs will be monitored.

[0184] UE is SCS configuration SN having Total for PDCCH reception scheduling through cells It is expected that non-overlapping CCEs will be monitored.

[0185] A second approach to avoiding upper-layer signaling to the UE is that the MN and SN to the UE and Exchange each value of, or MN It is to display the value of to SN. Then, is, and the UE is an SCS configuration To determine the number of PDCCH candidates or non-overlapping CCEs expected to be monitored in a cell with, all cells can be treated as if they were in a single CG.

[0186] for example, and is. SN is also from MN or UE Acquires.

[0187] The problem with the second embodiment is the SCS configuration of the active DL bandwidth portion (BWP) when the BWP transition can be triggered by the DCI format. The question is whether it can be used as a standard for a cell. Since one group of cells cannot know the BWP transitions triggered by the DCI format in the cells of another group of cells, having an active DL BWP that provides an SCS standard configuration for the cell can be problematic.

[0188] An alternative example is if the DL BWP providing the SCS reference configuration for the cell is determined solely by upper-layer signaling, then the upper-layer parameters firstActiveDownlinkBWP This includes the use of an SCS configuration for a BWP displayed to the UE, an SCS configuration for the BWP with the smallest index, etc. Conversely, when operating with a single CG, the SCS reference configuration for the cell may correspond to the active DL BWP.

[0189] A third approach is to limit the total number of cells that can be configured in the UE when the UE is configured for DC operation to four or fewer, which is considered the minimum UE capability when the UE is configured for Carrier Aggregation (CA) in at least one cell group. That is, the UE does not expect PDCCH processing to schedule PDSCH or PUSCH in more than four cells. If the UE is not configured for DC operation and is configured only for CA operation, the cell count limit may be greater than four.

[0190] Instead of MN and SN exchanging multiple cells with corresponding numerologies configured / activated in the UE to operate in their respective CGs (MCG and SCG), a functionally equivalent approach is for MN to inform SN of the number of PDCCH candidates reserved for use in MN or available in SN and / or the number of non-overlapping CCEs.

[0191] This number is either the total number across all SCS configurations or the number per SCS configuration. In the former case, the SN can derive the number of PDCCH candidates and / or non-overlapping CCEs available in the SCG by subtracting the corresponding number provided by the MN from the total number determined from the UE capabilities. The SN can also inform the MN of the corresponding number of PDCCH candidates and / or non-overlapping CCEs assigned to the UE for communication in each CG.

[0192] In one example, the SCS configuration of {0, 1, 2, 3} Regarding the UE's ability to monitor 4x {44, 36, 22, 20} PDCCH candidates per slot, the MN can inform the SN that the SN can configure up to {2x44, 3x36, 4x22, 4x20} PDCCH candidates for the UE for the cells of the SCG. For example, an SCS configuration of {0, 1, 2, 3} Regarding the UE's ability to monitor 4x {44, 36, 22, 20} PDCCH candidates per slot, the MN can inform the SN that the SN can configure up to {100, 50, 4x22, 4x20} PDCCH candidates for the UE. For example, an SCS configuration of {0, 1, 2, 3}. For a UE capability to monitor 4x {44, 36, 22, 20} PDCCH candidates per slot, the MN can inform the SN that the SN can configure up to {50%, 50%, 100%, 100%} of the PDCCH candidates in relation to the UE capability, and this signaling can be mapped to a predetermined set of percentages, such as a 3-bit signaling mapping for {0, 15, 30, 45, 60, 75, 90, 100}%, similar to the allocation of the number of non-overlapping CCEs per slot.

[0193] To determine the set of search spaces to monitor, for at least the second approach, the UE assigns sets of search spaces to the PCells of the MCG and the PSCells of the SCG in an alternating manner, starting from the MCG. For example, the UE configures the SCS with the PDCCH candidates to be monitored using the following pseudocode. It can be assigned to USS sets for PSCell and PCell that have an active DL BWP.

[0194] Index A search space set of CGs having non-nested CCE set for Indicated as (here, regarding MCG and regarding SCG Im), index CG with Cardinality Indicated by , where the search space set The non-nested CCEs for are the PDCCH candidates monitored for the CSS sets and all navigation space sets , It is determined by considering the monitored PDCCH candidates. Table 1 shows some of the configurations.

[0195] Table 1. Configuration Parameters

[0196]

[0197] Table 2 shows the behavior of the UE under some conditions.

[0198] Table 2. UE Operation

[0199]

[0200] As exemplified in Table 2, UE behavior for PDCCH candidates applies to non-overlapping CCEs in a similar manner. As exemplified in Table 2, UE behavior may be further conditioned on all symbols in the slot on the first active cell, which are UL symbols. As exemplified in Table 2, UE behavior may be extended to the active cell of the MCG (or SCG) in the case of synchronous behavior for at least the same SCS configurations on all scheduling cells of the MCG and SCG. That is, if the slot for the active cell of the MCG (or SCG) contains only UL symbols, for mutually active cells of the MCG (or SCG) containing at least one PDCCH monitoring occupancy in the slot (each symbol for at least one PDCCH monitoring occupancy is a DL symbol or a flexible symbol), the UE for the cells of the SCG within the slot Can be assigned PDCCH candidates (or for the cells of MCG within the slot) A maximum number of PDCCH candidates is allocated per slot (which can allocate PDCCH candidates).

[0201] In addition to dividing UE capabilities for PDCCH monitoring between the MCG and SCG, another UE capability that must be divided among the CGs is the maximum number of concurrent CSI reports that a UE can acquire and provide from all cells in the MCG and SCG. For example, in the case of CA operation, the UE, upper-tier parameters simultaneousCSI-ReportsAllCC The value of The ability to process the maximum number of simultaneous CSI reports (perform CSI-RS measurements) across all cells can be declared / reported by.

[0202] In the case of dual-link operation, the UE, for example, from the MN, a higher-level parameter indicating the maximum number of concurrent CSI reports the UE must be able to process across all cells of the MCG. simultaneousCSI-ReportsAllCC_MCG Value for and a higher-level parameter indicating the maximum number of concurrent CSI reports that the UE must be able to process across all cells of the SCG. simultaneousCSI-ReportsAllCC_SCG Value for You can receive it.

[0203] MN also, for example, through backhaul signaling, upper-layer parameters simultaneousCSI-ReportsAllCC_SCG The value of and, possibly, upper-level parameters simultaneousCSI-ReportsAllCC_MCG The value of You can inform SN of it.

[0204] For example, ...is. When operating in dual-connection mode, the UE may report individual capabilities to the MCG and SCG to indicate the maximum number of concurrent CSI reports the UE can provide to all cells in the MCG and SCG, respectively. This is also a higher-level parameter for multiple cells in the MCG and SCG that allows the UE to monitor the maximum number of PDCCH candidates per slot and per cell. pdcch-BlindDetectionCA_MCG and upper-level parameters pdcch-BlindDetectionCA_SCG This can also be applied to PDCCH monitoring capabilities that can report each of them. For example, the UE upper-level parameters synchronousCSI-ReportsAllCCMCG_UE Value for and upper-level parameters synchronousCSI-ReportsAllCCSCG_UE Value for You can report it. For example, is. For example, the UE is a higher-level parameter pdcch-BlindDetectionCA_MCG Value for and upper-level parameters pdcch-BlindDetectionCA_SCG Value for Can report.

[0205] The gNB may include a search space determination in the configuration of a set of search spaces for the UE. For example, the search space determination may be made according to Equation 1 or a nested search space. The first set of search spaces may be configured as a first search space for determining the CCE for a corresponding PDCCH candidate (e.g., Equation 1), and the second search space may be configured as a second search space for determining the CCE for a corresponding PDCCH candidate (e.g., a nested search space).

[0206] The configuration of the search space determination can also be conditioned in a UE that supports multiple services, such as multicast-broadcast broadband (MBB) services and ultra-reliability low latency communication (URLLC) services. Then, in a UE-specific search space set (USS set) configured to monitor PDCCH using DCI format(s) associated with MBB services and PDCCH using DCI format(s) associated with URLLC services, or configured to monitor PDCCH using DCI format(s) associated only with URLLC services, the UE can determine the CCE for PDCCH candidates using a nested search space while in a USS set configured to monitor PDCCH using DCI format(s) associated only with MBB services, and the UE can determine the CCE for PDCCH candidates using a search space according to Equation 1.

[0207] Although the present disclosure has been described by exemplary embodiments, various changes and modifications may be suggested to those skilled in the art. The present disclosure is intended to include such changes and modifications within the scope of the appended claims.

[0208] Nothing in the description herein shall be interpreted as indicating that any specific element, step, or function is an essential element, and such must be included in the claims. The scope of the invention is defined solely by the claims. Furthermore, unless a participial phrase follows the exact word “means for,” none of the claims herein is intended to apply 35 USC § 112(f).

Claims

Claim 1 In a method performed by a terminal of a communication system, the number of first cells and the number of second cells A step of receiving information regarding, wherein the number of first cells is the number of downlink (DL) cells related to the physical downlink control channel (PDCCH) candidate monitoring capability of the terminal based on the configuration associated with the master cell group (MCG), and the number of second cells The receiving step, which is the number of DL cells related to the PDCCH candidate monitoring capability of the terminal based on the configuration associated with the secondary cell group (SCG); Depending on Total number of 1st PDCCH candidates per slot for DL ​​cells As a step of determining, the above The DL cells have a subcarrier spacing (SCS) setting The DL cell of the MCG having a bandwidth portion (BWP), and the terminal is the Total number of the first PDCCH candidates per slot in the DL cells The step of determining the above, monitoring a number of PDCCH candidates; and Depending on Total number of 2nd PDCCH candidates per slot for DL ​​cells As a step for determining, The above The DL cells have SCS settings The DL cell of the SCG having a bandwidth portion (BWP) is the terminal, and the terminal is the Total number of the above 2nd PDCCH candidates per slot in DL cells A method characterized by including the step of determining, which monitors the number of PDCCH candidates. Claim 2 In claim 1, the total number of 1 PDCCH candidates per slot Is, It is determined based on, The above The maximum number of PDCCH candidates per slot for one of the DL cells, and Is It is a 'floor' function that provides the largest integer smaller than, and Is A method characterized by being a 'minimum' function that provides the smaller of the two. Claim 3 In paragraph 1, the above Total number of the above 1st PDCCH candidates per slot in DL cells By monitoring the following number of PDCCH candidates, the above of the master node (MN) The step of receiving a PDCCH for a DL cell; and the above Total number of the above 2nd PDCCH candidates per slot in DL cells By monitoring the number of PDCCH candidates below, the above of the secondary node (SN) A method characterized by further including the step of receiving a PDCCH for a DL cell. Claim 4 In paragraph 1, Accordingly, the above Total number of 1st non-nested CCEs per slot for DL ​​cells As a step of determining, the terminal is The total number of the first non-nested CCEs per slot in the DL cells The step of determining the above, monitoring the total number of non-overlapping CCEs of the following number; and Depending on Total number of 2nd non-nested CCEs per slot for DL ​​cells As a step of determining, the terminal is The total number of the second non-nested CCEs per slot in the DL cells A method characterized by further including the step of determining the total number of non-overlapping CCEs, which is less than or equal to the number of non-overlapping CCEs. Claim 5 In claim 1, the number of the second cells A method characterized by transmitting information about from a master node (MN) to a secondary node (SN). Claim 6 In a method performed by a base station of a communication system, the number of first cells and the number of second cells A step of transmitting information regarding, wherein the number of first cells is the number of downlink (DL) cells related to the terminal's PDCCH candidate monitoring capability based on the configuration associated with the Master Cell Group (MCG), and the number of the second cells. The transmitting step, which is the number of DL cells related to the PDCCH candidate monitoring capability of the terminal based on the configuration associated with the secondary cell group (SCG); and Depending on slots for downlink (DL) cells sugar Physical downlink control channel ( P DCC H ) after Number of bo As a step of determining, the above The DL cells have a subcarrier spacing (SCS) setting The DL cell of the MCG having a bandwidth portion (BWP), and the The terminal above Total number of the above PDCCH candidates per slot in DL cells A method characterized by including the step of determining to monitor the following number of PDCCH candidates. Claim 7 In Clause 6, the total number of PDCCH candidates per slot Is It is determined based on, The above The maximum number of PDCCH candidates per slot for one of the DL cells, and Is It is a 'flow' function that provides the largest integer smaller than, and Is A method characterized by being a 'minimum value' function that provides the smaller of the two. Claim 8 In Clause 6, the total number of PDCCH candidates per slot Using the PDCCH candidate among the following number of PDCCH candidates, the above A step of transmitting a PDCCH for a cell among the DL cells; and through a first link Transmitting and through the first link and the second link A method characterized by further including the step of transmitting. Claim 9 In paragraph 6, Accordingly, the above Total number of non-nested CCEs per slot for DL ​​cells A method characterized by further including a step of determining. Claim 10 In paragraph 6, the number of the second cells mentioned above A method characterized by transmitting information about from a master node (MN) to a secondary node (SN). Claim 11 A terminal of a communication system comprises a transmitting and receiving unit and a control unit, and the control unit comprises a first cell number and the number of second cells It is configured to receive information regarding, and the number of the first cells is the number of downlink (DL) cells related to the PDCCH candidate monitoring capability of the terminal based on the configuration associated with the master cell group (MCG), and the number of the second cells is the number of DL cells associated with the PDCCH candidate monitoring capability of the terminal based on the configuration associated with the secondary cell group (SCG), and Depending on per slot for DL ​​cells 1 Physical downlink control channel ( P DCC H ) after Total number of treasures It is configured to determine, and here the above The DL cells have a subcarrier spacing (SCS) setting The DL cell of the MCG having a bandwidth portion (BWP), and the terminal is the Total number of the first PDCCH candidates per slot in the DL cells Monitoring the following number of PDCCH candidates, Depending on Total number of 2nd PDCCH candidates per slot for DL ​​cells It is configured to determine, and the above The DL cells have SCS settings The DL cell of the SCG having a bandwidth portion (BWP) is the terminal, and the terminal is the Total number of the above 2nd PDCCH candidates per slot in DL cells A terminal characterized by monitoring the following number of PDCCH candidates. Claim 12 In Clause 11, the total number of 1st PDCCH candidates per slot Is It is determined based on, The above The maximum number of PDCCH candidates per slot for one of the DL cells; Is It is a 'flow' function that provides the largest integer smaller than, and Is A terminal characterized by being a 'minimum value' function that provides the smaller of the two. Claim 13 In Clause 11, the control unit is, Total number of the above 1st PDCCH candidates per slot in DL cells By monitoring the following number of PDCCH candidates, the above of the master node (MN) PDCCH for DL ​​cells, and the above Total number of the above 2nd PDCCH candidates per slot in DL cells By monitoring the number of PDCCH candidates below, the above of the secondary node (SN) A terminal characterized by being further configured to receive PDCCH for DL ​​cells. Claim 14 In Clause 11, the control unit is, Accordingly, the above Total number of 1st non-nested CCEs per slot for DL ​​cells and, Accordingly, the above Total number of 2nd non-nested CCEs per slot for DL ​​cells It is further configured to determine, and the terminal is the The total number of the first non-nested CCEs per slot in the DL cells Monitors the total number of non-overlapping CCEs of the following number, and the terminal The total number of the second non-nested CCEs per slot in the DL cells A terminal characterized by monitoring the total number of non-overlapping CCEs of the following number. Claim 15 In Clause 11, the number of the second cells mentioned above A terminal characterized by information about being transmitted from a master node (MN) to a secondary node (SN). Claim 16 A base station of a communication system comprises a transceiver and a control unit, and the control unit comprises a first cell number and the number of second cells Transmitting information regarding, and the number of the first cells is the number of downlink (DL) cells related to the terminal's PDCCH candidate monitoring capability based on the configuration associated with the Master Cell Group (MCG), and the number of the second cells. is the number of DL cells associated with the PDCCH candidate monitoring capability of the terminal based on the configuration associated with the secondary cell group (SCG), and Depending on slots for downlink (DL) cells sugar Physical downlink control channel ( P DCC H ) after Number of bo It is configured to determine, and the above The DL cells have a subcarrier spacing (SCS) setting The DL cell of the MCG having a bandwidth portion (BWP), and the The terminal above Total number of the above PDCCH candidates per slot in DL cells A base station characterized by being determined to monitor the following number of PDCCH candidates. Claim 17 In Clause 16, the total number of PDCCH candidates per slot Is It is determined based on, The above The maximum number of PDCCH candidates per slot for one of the DL cells, and Is It is a 'flow' function that provides the largest integer smaller than, and Is A base station characterized by being a 'minimum value' function that provides the smaller of the two. Claim 18 In paragraph 16, the control unit comprises the total number of PDCCH candidates per slot Using the PDCCH candidate among the following number of PDCCH candidates, the above Transmit a PDCCH for a cell among the DL cells, and through the first link Transmitting and through the first link and the second link A base station characterized by being further configured to transmit. Claim 19 In Clause 16, the above control unit Accordingly, the above Total number of non-nested CCEs per slot for DL ​​cells A base station characterized by being further configured to determine Claim 20 In Clause 16, the number of the second cells mentioned above A base station characterized by information about being transmitted from a master node (MN) to a secondary node (SN).

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