Method, apparatus and medium for wireless communication

Abstract

The present disclosure relates to a search space set for monitoring a physical downlink control channel (PDCCH) of a cell in a plurality of cells. For example, a method of wireless communication includes: receiving, by a user equipment (UE), one or more search space sets of a second cell. The method also includes: performing, by the UE, a first physical downlink control channel (PDCCH) monitoring of the second cell in a first cell based on the one or more search space sets, and performing a second PDCCH monitoring of the second cell in the second cell. In addition, other aspects and features are claimed and described.

Description

Technical Field

[0001] Aspects of the present disclosure relate generally to wireless communication systems, and more particularly, but not limited to, a set of search spaces for monitoring a physical downlink control channel (PDCCH) of one cell among multiple cells. Background Art

[0002] Wireless communication networks are widely deployed to provide various communication services such as voice, video, packet data, messaging, broadcast, etc. These wireless networks may be multiple-access networks capable of supporting multiple users by sharing the available network resources. Such networks are typically multiple-access networks that support communication for multiple users by sharing the available network resources.

[0003] A wireless communication network may include several base stations or Node Bs that may support communication for several user equipments (UEs). A UE may communicate with a base station via a downlink and an uplink. A downlink (or forward link) refers to the communication link from a base station to a UE, and an uplink (or reverse link) refers to the communication link from a UE to a base station.

[0004] The base station may transmit data and control information to the UE on the downlink, and / or may receive data and control information from the UE on the uplink. On the downlink, the transmission from the base station may encounter interference from neighboring base stations or other wireless radio frequency (RF) transmitters. On the uplink, the transmission from the UE may encounter interference from uplink transmissions of other UEs communicating with neighboring base stations or from other wireless RF transmitters. This interference may degrade the performance of both the downlink and uplink.

[0005] As the demand for mobile broadband access continues to increase, the potential for interference and network congestion increases as more UEs access long-range wireless communication networks and more short-range wireless systems are deployed into communities. Research and development continues to advance wireless technology, not only to meet the growing demand for mobile broadband access, but also to advance and enhance the user experience of mobile communications. Summary of the invention

[0006] The following summarizes some aspects of the present disclosure to provide a basic understanding of the technology discussed. This summary is not a comprehensive overview of all expected features of the present disclosure, and is neither intended to identify key or important elements of all aspects of the present disclosure, nor to delimit the scope of any or all aspects of the present disclosure. Its sole purpose is to introduce some concepts of one or more aspects of the present disclosure in a summarized form as a preface to the more detailed description introduced later.

[0007] In one aspect of the present disclosure, according to some aspects, a method of wireless communication includes: receiving, by a user equipment (UE), one or more search space sets of a second cell. The method also includes: performing, by the UE, first physical downlink control channel (PDCCH) monitoring of the second cell in a first cell based on the one or more search space sets, and performing second PDCCH monitoring of the second cell in the second cell.

[0008] In another aspect of the present disclosure, an apparatus configured for wireless communication includes: a device (means) for receiving one or more search space sets of a second cell by a user equipment (UE). The apparatus also includes: a device for the UE to perform a first physical downlink control channel (PDCCH) monitoring of the second cell in a first cell based on the one or more search space sets, and to perform a second PDCCH monitoring of the second cell in the second cell.

[0009] In another aspect of the present disclosure, a non-transitory computer-readable medium having program code recorded thereon includes: code for receiving, by a user equipment (UE), one or more search space sets of a second cell, and for the UE to perform, in a first cell, first physical downlink control channel (PDCCH) monitoring of the second cell based on the one or more search space sets, and to perform, in a second cell, second PDCCH monitoring of the second cell.

[0010] In another aspect of the present disclosure, a device configured for wireless communication is disclosed. The device includes: at least one processor; and a memory coupled to the processor. The processor is configured to: receive one or more search space sets of a second cell by a user equipment (UE), and perform, by the UE, first physical downlink control channel (PDCCH) monitoring of the second cell in a first cell based on the one or more search space sets, and perform second PDCCH monitoring of the second cell in the second cell.

[0011] In another aspect of the present disclosure, a device configured for wireless communication is disclosed. The device includes: an interface configured for wireless communication and a processor system coupled to the interface. The processor system is configured to: receive one or more search space sets of a second cell by a user equipment (UE), and perform, by the UE based on the one or more search space sets, a first physical downlink control channel (PDCCH) monitoring of the second cell in a first cell, and perform a second PDCCH monitoring of the second cell in the second cell.

[0012] Other aspects, features, and embodiments will become apparent to those of ordinary skill in the art upon reviewing specific, exemplary embodiments in conjunction with the accompanying drawings. Although features may be discussed below with respect to specific embodiments and the accompanying drawings, all embodiments may include one or more advantageous features discussed herein. In other words, although one or more embodiments may be discussed as having specific advantageous features, one or more of these features may also be used according to various embodiments. In a similar manner, although exemplary embodiments may be discussed below with respect to embodiments of a device, system, or method, exemplary embodiments may be implemented in various devices, systems, and methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The nature and advantages of the present disclosure may be further understood by reference to the following drawings. In the drawings, similar components or features may be labeled with the same reference numerals. In addition, various components of the same type may be distinguished by adding a dash after the reference numeral and a second label that distinguishes between similar components. If only the first reference numeral is used in the specification, the description applies to any one of the similar components having the same first reference numeral regardless of the second reference numeral.

[0014] Figure 1 is a block diagram showing details of a wireless communication system according to some embodiments of the present disclosure.

[0015] Figure 2 is a block diagram conceptually illustrating a design of a base station and a UE configured according to some embodiments of the present disclosure.

[0016] Figure 3 is a block diagram illustrating a wireless communication system with communications utilizing a search space set to monitor a physical downlink control channel (PDCCH) of one cell among multiple cells in accordance with some aspects of the present disclosure.

[0017] Figure 4 is a diagram illustrating an example of monitoring a PDCCH of one cell among multiple cells according to some aspects of the present disclosure.

[0018] Figure 5 is a diagram showing another example of monitoring a PDCCH of one cell among multiple cells according to some aspects of the present disclosure.

[0019] Figure 6 is a diagram showing another example of monitoring a PDCCH of one cell among multiple cells according to some aspects of the present disclosure.

[0020] Figure 7 is a diagram showing another example of monitoring a PDCCH of one cell among multiple cells according to some aspects of the present disclosure.

[0021] Figure 8 is a flow diagram illustrating example blocks executed by a UE according to some aspects of the present disclosure.

[0022] Fig. 9 is a block diagram conceptually illustrating an example design of a UE in accordance with some aspects of the present disclosure.

[0023] Fig.10 is a block diagram conceptually illustrating an example design of a base station in accordance with some aspects of the present disclosure.

[0024] The appendix further provides further details on various embodiments of the present disclosure, and the subject matter of the appendix constitutes part of the specification of the present application. DETAILED DESCRIPTION

[0025] The detailed description made below in conjunction with the drawings and appendices is intended as a description of various configurations and is not intended to limit the scope of the present disclosure. Instead, the detailed description includes specific details, the purpose of which is to provide a comprehensive understanding of the subject matter of the present invention. It will be apparent to those skilled in the art that these specific details are not required in every case, and in some cases, for clarity of presentation, well-known structures and components are shown in the form of block diagrams.

[0026] The present disclosure generally relates to providing or participating in communication between two or more wireless devices in one or more wireless communication systems (also referred to as wireless communication networks). In various embodiments, these techniques and devices can be used in wireless communication networks, such as code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, single carrier FDMA (SC-FDMA) networks, LTE networks, GSM networks, 5th generation (5G) or new radio (NR) networks (sometimes referred to as "5G NR" networks / systems / devices), and other communication networks. As described herein, the terms "network" and "system" can be used interchangeably.

[0027] For example, a CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (UTRA), cdma2000, etc. UTRA includes Wideband-CDMA (W-CDMA) and Low Chip Rate (LCR). CDMA2000 includes IS-2000, IS-95, and IS-856 standards.

[0028] For example, a TDMA network may implement a radio technology such as GSM. 3GPP defines the standard for the GSM EDGE (Enhanced Data Rates for GSM Evolution) radio access network (RAN), also known as GERAN. GERAN and the network connecting base stations (e.g., Ater and Abis interfaces) and base station controllers (A interfaces, etc.) are the radio components of GSM / EDGE. The radio access network is a component of the GSM network through which phone calls and packet data are routed from the public switched telephone network (PSTN) and the Internet to user handsets (also known as user terminals or user equipment (UE)), and from user handsets to the PSTN and the Internet. A mobile phone operator's network may include one or more GERANs, which may be coupled to a universal terrestrial radio access network (UTRAN) in the case of a UMTS / GSM network. The operator network may also include one or more LTE networks, and / or one or more other networks. Various different network types may use different radio access technologies (RATs) and radio access networks (RANs).

[0029] OFDMA network can realize radio technology, such as evolution UTRA (E-UTRA), IEEE 802.11, IEEE802.16, IEEE 802.20, flash-OFDM etc.UTRA, E-UTRA and global system for mobile communication (GSM) are parts of universal mobile telecommunication system (UMTS).Specifically, long term evolution (LTE) is the version of UMTS using E-UTRA.UTRA, E-UTRA, GSM, UMTS and LTE are described in the document provided by the organization called "3rd generation partnership project" (3GPP), and cdma2000 is described in the document of the organization called "3rd generation partnership project 2" (3GPP2).These different radio technologies and standards are known or under development.For example, the 3rd generation partnership project (3GPP) is a cooperation between telecommunication association groups, aiming to define the third generation (3G) mobile phone specification applicable worldwide.3GPP long term evolution (LTE) is a 3GPP project, and its purpose is to improve the universal mobile telecommunication system (UMTS) mobile phone standard. 3GPP may define specifications for the next generation of mobile networks, mobile systems, and mobile devices. The present disclosure is concerned with the evolution of wireless technologies from LTE, 4G, 5G, NR, and beyond, and the use of new and different radio access technologies or sets of radio air interfaces to share access to wireless spectrum between networks.

[0030] 5G networks take into account diversified deployments, diversified spectrum, and diversified services and devices that can be implemented using a unified OFDM-based air interface. To achieve these goals, in addition to developing new radio technologies for 5G NR networks, further enhancements to LTE and LTE-A are also considered. 5G NR will be able to scale to (1) provide coverage for massive Internet of Things (IoT) with ultra-high density (e.g., ~1 million nodes / km2), ultra-low complexity (e.g., ~10 bits / second), ultra-low energy (e.g., ~10+ years of battery life), and deep coverage capable of reaching difficult locations; (2) provide coverage including mission-critical control with strong security to protect sensitive personal, financial, or confidential information, ultra-high reliability (e.g., ~99.9999% reliability), ultra-low latency (e.g., ~1 millisecond), and for users with wide range of mobility or lack of mobility; and (3) provide coverage with enhanced mobile broadband including extremely high capacity (e.g., ~10 Tbps / km2), extremely high data rates (e.g., multi-Gbps rates, greater than 100 Mbps user experience rates), and deep awareness with advanced discovery and optimization.

[0031] 5G NR devices, networks, and systems can be implemented to use optimized OFDM-based waveform features. These features may include: scalable numerology and transmission time intervals (TTIs); a general, flexible framework for efficiently multiplexing services and features through dynamic, low-latency time division duplex (TDD) / frequency division duplex (FDD) designs; and advanced wireless technologies such as massive multiple-input multiple-output (MIMO), robust millimeter wave (mmWave) transmission, advanced channel coding, and device-centric mobility. The scalability of the numerology in 5G NR and the extension of subcarrier spacing can efficiently address the operation of different services between different spectrums and different deployments. For example, in various outdoor and macro coverage deployments of FDD / TDD implementations less than 3 GHz, the subcarrier spacing may appear at 15 kHz (e.g., on bandwidths of 1, 5, 10, 20 MHz, etc.). For other various outdoor and small cell coverage deployments of TDD greater than 3 GHz, the subcarrier spacing may appear at 30 kHz on a bandwidth of 80 / 100 MHz. For various other indoor broadband implementations, subcarrier spacing may occur at 60kHz over a 160MHz bandwidth using TDD in the unlicensed portion of the 5GHz band. Finally, for various deployments transmitting with a millimeter wave component using TDD at 28GHz, subcarrier spacing may occur at 120kHz over a 500MHz bandwidth.

[0032] 5G NR's scalable parameter set facilitates scalable TTI for different latency and quality of service (QoS) requirements. For example, shorter TTIs can be used for low latency and high reliability, while longer TTIs can be used for higher spectral efficiency. Efficient multiplexing of long and short TTIs allows transmission to start on symbol boundaries. 5G NR also allows for a self-contained integrated subframe design with uplink / downlink scheduling information, data, and acknowledgment in the same subframe. The self-contained integrated subframe supports communications in unlicensed or contention-based shared spectrum, adaptive uplink / downlink, which can be flexibly configured on a per-cell basis, dynamically switching between uplink and downlink to meet current traffic demands.

[0033] For clarity, certain aspects of the apparatus and techniques may be described below with reference to exemplary LTE implementations or in an LTE-centric manner, and in parts of the following description, LTE terminology may be used as an illustrative example; however, the description is not intended to be limited to LTE applications. In fact, the present disclosure relates to shared access to wireless spectrum between networks using different radio access technologies or radio air interfaces (such as 5G NR).

[0034] In addition, it should be understood that in operation, the wireless communication network adapted according to the concepts herein can operate with any combination of licensed or unlicensed spectrum according to load and availability. Therefore, it will be apparent to those skilled in the art that the systems, devices and methods described herein can be applied to other communication systems and applications besides the specific examples provided.

[0035] Although various aspects and embodiments are described in this application by illustrating some examples, it will be understood by those skilled in the art that additional implementations and use cases may occur in many different arrangements and scenarios. The innovations described herein can be implemented in many different platform types, devices, systems, shapes, sizes, and packaging arrangements. For example, various embodiments and / or uses may be implemented via integrated chip embodiments and / or other devices based on non-module components (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail / purchasing devices, medical devices, AI-enabled devices, etc.). Although some examples may or may not be specifically targeted at use cases or applications, the innovations described may have wide applicability. The range of implementations may range from chip-level or modular components to non-modular, non-chip-level implementations, and further to aggregated, distributed, or OEM devices or systems that include one or more of the described aspects. In some practical environments, devices that combine the described aspects and features may also necessarily include additional components and features to implement and implement the required and described embodiments. It is intended that the innovations described herein may be implemented in a variety of embodiments, including large / small devices of varying sizes, shapes, and configurations, chip-level components, multi-component systems (e.g., RF chains, communication interfaces, processors), distributed arrangements, end-user devices, etc.

[0036] Figure 1 A wireless network 100 for communication according to some embodiments is shown. The wireless network 100 may, for example, include a 5G wireless network. As will be appreciated by those skilled in the art, Figure 1 The components appearing in may have related counterparts in other network arrangements, including, for example, cellular network arrangements and non-cellular network arrangements (eg, device-to-device or peer-to-peer or ad hoc network arrangements, etc.).

[0037] Figure 1The wireless network 100 shown includes several base stations 105 and other network entities. The base station can be a station that communicates with the UE, and can be called an evolved node B (eNB), a next generation eNB (gNB), an access point, etc. Each base station 105 can provide communication coverage for a specific geographic area. In 3GPP, the term "cell" can refer to the specific geographic coverage area of ​​the base station and / or base station subsystem serving the coverage area, depending on the context in which the term is used. In the embodiment of the wireless network 100 herein, the base station 105 can be associated with the same operator or different operators (for example, the wireless network 100 can include multiple operator wireless networks), and can provide wireless communication using one or more frequencies (for example, one or more frequency bands in a licensed spectrum, an unlicensed spectrum, or a combination thereof) that are the same as the neighboring cells. In some examples, a single base station 105 or UE115 can be operated by more than one network operating entity. In other examples, each base station 105 and UE 115 can be operated by a single network operating entity.

[0038] A base station may provide communication coverage for a macro base station or a small cell (such as a pico cell or a femto cell) and / or other types of cells. A macro cell generally covers a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access to UEs that subscribe to services from a network provider. Small cells (such as pico cells) generally cover a relatively small geographic area and may allow unrestricted access to UEs that subscribe to services from a network provider. Small cells (such as femto cells) generally also cover a relatively small geographic area (e.g., a home) and, in addition to unrestricted access, may provide restricted access to UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs of users in a home, etc.). The base station of a macro cell may be referred to as a macro base station. The base station of a small cell may be referred to as a small cell base station, a pico base station, a femto base station, or a home base station. In Figure 1 In the example shown, base stations 105d and 105e are ordinary macro base stations, while base stations 105a to 105c are macro base stations that implement one of 3-dimensional (3D) MIMO, full-dimensional (FD) MIMO, or massive MIMO. Base stations 105a to 105c utilize their high-dimensional MIMO capabilities to utilize 3D beamforming in beamforming in elevation and azimuth to increase coverage and capacity. Base station 105f is a small cell base station that can be a home node or a portable access point. The base station can support one or more (e.g., two, three, four, etc.) cells.

[0039] Wireless network 100 may support synchronous or asynchronous operation. For synchronous operation, base stations may have similar frame timing, and transmissions from different base stations may be approximately aligned in time. For asynchronous operation, base stations may have different frame timing, and transmissions from different base stations may not be aligned in time. In some cases, the network may be enabled or configured to handle dynamic switching between synchronous operation or asynchronous operation.

[0040] UE 115 is dispersed throughout the wireless network 100, and each UE can be fixed or mobile. It should be understood that although mobile devices are generally referred to as user equipment (UE) in the standards and specifications promulgated by the 3rd Generation Partnership Project (3GPP), such devices may also be referred to as mobile stations (MS), user stations, mobile units, user units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile user stations, access terminals (AT), mobile terminals, wireless terminals, remote terminals, handsets, terminals, user agents, mobile clients, clients or other appropriate terms by those skilled in the art. In this article, a "mobile" device or UE does not necessarily require the ability to move and can be stationary. Some non-limiting examples of mobile devices (such as embodiments that may include one or more UE 115) include mobile phones, cellular (cell) phones, smart phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, laptop computers, personal computers (PCs), notebooks, netbooks, smart books, tablet computers, and personal digital assistants (PDAs). In addition, the mobile device may be an "Internet of Things" (IoT) or "Internet of Everything" (IoE) device, such as a car or other transportation vehicle, a satellite radio, a global positioning system (GPS) device, a logistics controller, a drone, a multi-rotor aircraft, a quadcopter, a smart energy or security device, a solar panel or solar array, municipal lighting, water or other infrastructure; industrial automation and enterprise equipment; consumer and wearable devices, such as glasses, wearable cameras, smart watches, health or fitness trackers, mammal implants, gesture tracking devices, medical devices, digital audio players (e.g., MP3 players), cameras, game consoles, etc.; and digital home or smart home devices, such as home audio, video and multimedia devices, home appliances, sensors, vending machines, smart lighting, home security systems, smart meters, etc. In one aspect, the UE may be a device including a universal integrated circuit card (UICC). In another aspect, the UE may be a device that does not include a UICC. In some aspects, a UE that does not include a UICC may also be referred to as an IoE device. Figure 1The UEs 115a to 115d of the illustrated embodiment are examples of mobile smartphone-type devices accessing the wireless network 100. The UE may also be a machine specifically configured for connected communications, including machine type communications (MTC), enhanced MTC (eMTC), narrowband IoT (NB-IoT), etc. Figure 1 The illustrated UEs 115 e through 115 k are examples of various machines configured for communications accessing the wireless network 100 .

[0041] A mobile device, such as UE 115, can communicate with any type of base station, whether macro, pico, femto, repeater, etc. Figure 1 In the present invention, a lightning beam (e.g., a communication link) indicates a wireless transmission between a UE and a serving base station (specifying a base station serving the UE on a downlink and / or uplink), or an expected transmission between base stations, and a backhaul transmission between base stations. Backhaul communications between base stations of the wireless network 100 may occur using wired and / or wireless communication links.

[0042] In operation of the wireless network 100, base stations 105a to 105c serve UEs 115a and 115b using 3D beamforming and coordinated spatial techniques such as coordinated multipoint (CoMP) or multi-connectivity. Macro base station 105d performs backhaul communications with base stations 105a to 105c and small cells, base station 105f. Macro base station 105d also transmits multicast services that are subscribed to and received by UEs 115c and 115d. Such multicast services may include mobile television or streaming video, or may include other services that provide community information, such as weather emergencies or alerts, such as Amber alerts or gray alerts.

[0043] The wireless network 100 of the embodiment supports mission-critical communications with ultra-reliable and redundant links with mission-critical devices, such as UE 115e as a drone. The redundant communication links with UE 115e include links from macro base stations 105d and 105e, and small cell base station 105f. Other machine-type devices, such as UE 115f (thermometer), UE 115g (smart meter), and UE 115h (wearable device), can communicate directly with base stations, such as small cell base station 105f and macro base station 105e, through the wireless network 100, or in a multi-hop configuration by communicating with another user device that relays its information to the network, such as UE 115f transmitting temperature measurement information to the smart meter (UE 115g), which is then reported to the network through the small cell base station 105f. The wireless network 100 may also provide additional network efficiency through dynamic, low-latency TDD / FDD communications, such as in a vehicle-to-vehicle (V2V) mesh network between UEs 115i to 115k communicating with a macro base station 105e.

[0044] Typically, based on cross-carrier scheduling, the PDCCH of the serving cell is monitored in the cell itself or in another cell. For example, each cell can schedule data based on the PDCCH received by itself, and all other PDCCHs configured for the cell are monitored in the cell itself. As another example, a PDCCH with DCI 0-1 / 1-1 of the second cell data is received in the scheduling cell (the first cell).

[0045] In some cases, it may be advantageous to allow the PDCCH of a serving cell to be monitored in multiple (e.g., ≥2) cells. For example, some PDCCHs of a second cell are received in another cell (the first cell), and other PDCCHs of the second cell are received in itself (i.e., the second cell). For example, SCell data is cross-carrier scheduled by a non-fallback DCI (0-1, 1-1) of another cell, and SCell data may also be self-scheduled by a fallback DCI (0-0, 1-0). As another example, PCell data is cross-carrier scheduled by a non-fallback DCI (0-1, 1-1) in another cell, and other (or all other) DCIs including group-common DCI and broadcast data-scheduled DCI are still received in PCell.

[0046] As further described herein, the PDCCH of a cell is advantageously monitored in itself and in another cell. Monitoring the PDCCH of a cell in multiple cells can allow flexible control resource utilization for carrier aggregation. For example, PDCCH monitoring in another cell can offload control signaling in the serving cell. Additionally or alternatively, when the PDCCH of the serving cell is monitored in another cell, it can be extended to DCI other than non-fallback DCI for cross-carrier scheduling.

[0047] Figure 2 A block diagram showing a design of a base station 105 and a UE 115, which may be Figure 1 For the restricted association scheme (described above), the base station 105 can be any base station and UE in Figure 1 The small cell base station 105f in the example, and the UE 115 may be a UE 115c or 115d operating in the service area of ​​the base station 105f, which will be included in the list of accessible UEs of the small cell base station 105f in order to access the small cell base station 105f. The base station 105 may also be some other type of base station. Figure 2 As shown, the base station 105 can be equipped with antennas 234a through 234t, and the UE 115 can be equipped with antennas 252a through 252r, to facilitate wireless communications.

[0048] At the base station 105, the transmission processor 220 can receive data from the data source 212 and control information from the controller / processor 240. The control information can be used for a physical broadcast channel (PBCH), a physical control format indicator channel (PCFICH), a physical hybrid ARQ (automatic repeat request) indicator channel (PHICH), a physical downlink control channel (PDCCH), an enhanced physical downlink control channel (EPDCCH), an MTC physical downlink control channel (MPDCCH), etc. The data can be used for PDSCH, etc. The transmission processor 220 can process (e.g., encode and symbol map) the data and the control information to obtain data symbols and control symbols, respectively. The transmission processor 220 can also generate reference symbols (e.g., for a primary synchronization signal (PSS) and a secondary synchronization signal (SSS)) and a cell-specific reference signal. (If applicable), the transmission (TX) multiple-input multiple-output (MIMO) processor 230 can perform spatial processing (e.g., precoding) on ​​the data symbols, control symbols, and / or reference symbols, and can provide output symbol streams to modulators (MODs) 232a to 232t. Each modulator 232 can process a corresponding output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Additionally or alternatively, each modulator 232 can process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. The downlink signals from modulators 232a through 232t can be transmitted via antennas 234a through 234t, respectively.

[0049] At the UE 115, antennas 252a to 252r can receive downlink signals from the base station 105 and can provide received signals to demodulators (DEMOD) 254a to 254r, respectively. Each demodulator 254 can adjust (e.g., filter, amplify, downconvert and digitize) the corresponding received signal to obtain input samples. Each demodulator 254 can also process the input samples (e.g., for OFDM, etc.) to obtain received symbols. The MIMO detector 256 can obtain the received symbols from the demodulators 254a to 254r, (if applicable), perform MIMO detection on the received symbols, and provide the detected symbols. The receiving processor 258 can process (e.g., demodulate, deinterleave and decode) the detected symbols, provide the decoded data of the UE 115 to the data sink 260, and provide the decoding control information to the controller / processor 280.

[0050] On the uplink, at the UE 115, a transmit processor 264 may receive and process data (e.g., of a physical uplink shared channel (PUSCH)) from a data source 262 and control information (e.g., of a physical uplink control channel (PUCCH)) from a controller / processor 280. The transmit processor 264 may also generate reference symbols for a reference signal. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 (if applicable), further processed by modulators 254a through 254r (e.g., for SC-FDM, etc.), and transmitted to the base station 105. At the base station 105, the uplink signals from the UE 115 may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236 (if applicable), and further processed by the receive processor 238 to obtain decoded data and control information transmitted by the UE 115. Processor 238 may provide decoded data to a data sink 239 and decode control information to controller / processor 240 .

[0051] The controllers / processors 240 and 280 may direct operations at the base station 105 and the UE 115, respectively. The controller / processor 240 and / or other processors and modules at the base station 105 and / or the controller / processor 280 and / or other processors and modules at the UE 115 may perform or direct the execution of various processes for the techniques described herein, such as performing or directing Figure 8 The execution shown and / or other processes of the techniques described herein. Memories 242 and 282 may store data and program codes for base station 105 and UE 115, respectively. Scheduler 244 may schedule UEs for data transmission on the downlink and / or uplink.

[0052] Wireless communication systems operated by different network operating entities (e.g., network operators) may share spectrum. In some cases, a network operating entity may be configured to use the entire designated shared spectrum at least for a certain period of time before another network operating entity uses the entire designated shared spectrum for a different period of time. Therefore, in order to allow network operating entities to use the entire designated shared spectrum and to mitigate interfering communications between different network operating entities, specific resources (e.g., time) may be divided and allocated to different network operating entities for specific types of communications.

[0053] For example, a network operating entity may be allocated specific time resources reserved for dedicated communications by the network operating entity using the entire shared spectrum. A network operating entity may also be allocated other time resources where the entity has a preference over other network operating entities to use the shared spectrum for communications. These time resources are prioritized for use by the network operating entity and may be opportunistically used by other network operating entities if the prioritized network operating entity does not use them. Additional time resources may be opportunistically allocated for use by any network operator.

[0054] Access to the shared spectrum and arbitration of time resources between different network operating entities may be centrally controlled by a single entity, automatically determined through a predefined arbitration scheme, or dynamically determined based on interactions between the network operator's wireless nodes.

[0055] In some cases, the UE 115 and the base station 105 may operate in a frequency band of a shared radio spectrum, which may include licensed or unlicensed (e.g., contention-based) spectrum. In the unlicensed frequency portion of the frequency band of the shared radio spectrum, the UE 115 or the base station 105 may conventionally perform a medium sensing process to contend for access to the spectrum. For example, the UE 115 or the base station 105 may perform a listen-before-talk (LBT) process (such as a clear channel assessment (CCA) before communication) to determine whether the shared channel is available. CCA may include an energy detection process to determine whether there are any other active transmissions. For example, the device may infer that a change in the received signal strength indicator (RSSI) of the power meter indicates that the channel is occupied. Specifically, a signal power concentrated in a particular bandwidth and exceeding a predetermined noise floor may indicate another wireless transmitter. CCA may also include detection of a specific sequence indicating channel use. For example, another device may transmit a specific preamble before transmitting a data sequence. In some cases, the LBT process may include the wireless node adjusting its own backoff window based on the amount of energy detected on the channel and / or acknowledgement / negative acknowledgement (ACK / NACK) feedback of its own transmitted packets as a conflicting proxy.

[0056] Figure 3 is a block diagram of an example wireless communication system 300 that utilizes physical downlink control channel (PDCCH) monitoring. In some examples, the wireless communication system 300 can implement aspects of the wireless communication system 100. For example, the wireless communication system 300 can include a UE 115, one or more base stations (such as a first base station 105 and a second base station 305), and a core network 130. Although one UE and two base stations are shown, in other embodiments, the wireless communication system 300 can include multiple UEs 115, a single base station 105 or more than two base stations 105, or both.

[0057] UE 115 may include various components (e.g., structural hardware components) for performing one or more functions described herein. For example, these components may include a processor 302, a memory 304, a transmitter 316, a receiver 318, a cross-carrier scheduler 322, and a PDCCH monitor 323. The processor 302 may be configured to execute instructions stored at the memory 304 to perform the operations described herein. In some embodiments, the processor 302 includes or corresponds to the controller / processor 280, and the memory 304 includes or corresponds to the memory 282. In addition to the instructions stored at the memory 304, the memory 304 may be configured to store DCI format information 310, SS information 311, and control resource set (CORESET) information 312.

[0058] The DCI format information 310 may include or identify one or more DCI formats. For example, the one or more DCI formats may include:

[0059] DCI 0_0 and DCI 1_0 for fallback DCI;

[0060] DCI 0_1 and DCI 1_1 for non-fallback DCI;

[0061] DCI 2_0 used to notify the time slot format;

[0062] DCI 2_1 for notifying physical resource blocks (PRBs) and orthogonal frequency division multiplexing (OFDM) symbols, where the UE may assume that there is no transmission for the UE;

[0063] DCI 2_2 for transmitting TPC commands for PUCCH and PUSCH; and

[0064] DCI 2_3 used to transmit a set of TPC commands for SRS transmission.

[0065] SS information 311 may include or indicate an SS set index or SS type, such as CSS or USS. CORESET information 312 may include a set of time / frequency resources where PDCCH can be transmitted. CORESET may be semi-statically configured by the network, and multiple CORESETs may exist in a carrier, and it may appear anywhere in a time slot and in the frequency range of the carrier. In an embodiment, a separate CORESET has a maximum length, such as a maximum length of 3 OFDM symbols. PDCCH may be transmitted in a CORESET, and the CORESET represents a signal location where a given device may receive PDCCH. The basic union of a CORESET is a resource element group. If a CORESET ID (ControlResourceSetId) is included in the SS set configuration (SearchSpace), the CORESET may be associated with an SS set. DCI format information 310, SS information 311, and / or CORESET information 312 may be determined or set based on a standard, or may be set or determined by a network (e.g., 130). When set or determined by the network, UE 115 may receive such information via network information 383.

[0066] The transmitter 316 is configured to transmit data to one or more other devices, and the receiver 318 is configured to receive data from one or more other devices. For example, the transmitter 316 can transmit data via a wireless network, and the receiver 318 can receive data via a wireless network. In some embodiments, the transmitter 316 and the receiver 318 can be replaced by a transceiver. Additionally or alternatively, the transmitter 316, the receiver 318, or both can include or correspond to the reference Figure 2 One or more components of UE 115 are described.

[0067] The cross-carrier scheduler 322 is configured to perform and / or coordinate cross-carrier scheduling operations. The PDCCH monitor 323 is configured to perform PDCCH monitoring for or belonging to one or more cells (eg, one or more base stations).

[0068] The first base station 105 includes a processor 330, a memory 332, a transmitter 334, a receiver 336, and a message generator 342. The processor 330 may be configured to execute instructions stored at the memory 332 to perform the operations described herein. In some embodiments, the processor 330 includes or corresponds to the controller / processor 240, and the memory 332 includes or corresponds to the memory 242. The memory 332 may include cross-carrier scheduling information 338, DCI format information 310, SS information 311, and CORESET information 312. The cross-carrier scheduling information 338 may be configured to implement cross-carrier scheduling operations associated with one or more base stations (e.g., 105, 305). The information generator 342 is configured to generate one or more PDCCH information messages.

[0069] The transmitter 334 is configured to transmit data to one or more other devices, and the receiver 336 is configured to receive data from one or more other devices. For example, the transmitter 334 can transmit data via a wireless network, and the receiver 336 can receive data via a wireless network. In some embodiments, the transmitter 334 and the receiver 336 can be replaced by a transceiver. Additionally or alternatively, the transmitter 334, the receiver 336, or both can include or correspond to the reference Figure 2 One or more components of base station 105 are described.

[0070] The second base station 305 may include or correspond to the first base station 105 , such that the second base station includes one or more components described with reference to the first base station 105 .

[0071] The base stations 105, 305 may communicate with the core network 130 and with each other. For example, the base stations 105 may interface with the core network 130 via a backhaul link (e.g., via S1, N2, N3, or other interface). The base stations 105 may communicate with each other directly (e.g., directly between the base stations 105) or indirectly (e.g., via the core network 130) over the backhaul link (e.g., via X2, Xn, or other interface).

[0072] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connections, and other access, routing or mobility functions. The core network 130 may be an evolved packet core (EPC), which may include at least one mobility management entity (MME), at least one serving gateway (S-GW), and at least one packet data network (PDN) gateway (P-GW). The MME may manage non-access stratum (e.g., control plane) functions such as mobility, authentication, and bearer management of UE 115 served by a base station 105 associated with the EPC. User IP packets may be transmitted through the S-GW, which itself may be connected to the P-GW. The P-GW may provide IP address allocation and other functions. The P-GW may be connected to the IP services of the network operator. The operator's IP services may include access to the Internet, an intranet, an IP multimedia subsystem (IMS), or a packet switched (PS) streaming service.

[0073] To facilitate cross-carrier scheduling, the network (e.g., 130) may configure a search space set in an active bandwidth part (BWP) (also referred to as a carrier bandwidth part) of a scheduled cell, the search space set having the same search space identifier (ID) as the search space set in the active BWP of the scheduling cell. The search space timing for PDCCH monitoring of the scheduled cell may be determined by the search space set configuration of the scheduling cell, and the number of PDCCH candidates for each aggregation level of the scheduled cell is determined by the search space set configuration of the scheduled cell. Additionally or alternatively, the network (e.g., 130) may generate one or more CORESETs for PDCCH transmission.

[0074] During operation of the system 300, the UE 115 may monitor the PDCCH of the first base station 105 (e.g., the first cell). For illustration, the UE 115 may monitor one or more first PDCCH messages 360 from the first base station 105. The one or more first PDCCH messages 360 may be generated by the message generator 342 and transmitted via the transmitter 334. Additionally or alternatively, the UE 115 may monitor the PDCCH of the first base station 105 in another cell (in addition to the first cell). For illustration, the UE may monitor one or more second PDCCH messages 361 from the second base station 305 (e.g., the second cell).

[0075] In other embodiments, the UE 115 receives one or more search space sets of the second base station 305 (e.g., the second cell). The one or more search space sets may be stored in a memory as SS information 311. The UE 115 may perform a first PDCCH monitoring of the second cell in the first cell (e.g., the first base station 105) and a second PDCCH monitoring of the second cell in the second cell based on the one or more search space sets. For example, the UE 115 may perform a first PDCCH monitoring using the PDCCH monitor 323 to receive a first PDCCH message 360, and may perform a second PDCCH monitoring using the PDCCH monitor 323 to receive a second PDCCH message 361.

[0076] In some embodiments, one or more rules are described herein for a network (e.g., 130) to configure a search space set and a CORESET for monitoring a cell's PDCCH in two cells. Such a rule may define or indicate how to determine a cell's search space set for monitoring its own PDCCH in itself, and how to determine a search space set for monitoring its own PDCCH in another cell. Additionally or alternatively, such a rule may define or indicate how to determine a CORESET associated with a search space set.

[0077] In some embodiments, the network (e.g., 130) configures a search space set in a second cell (e.g., 305), whose PDCCH can be monitored in itself (the second cell) and in another cell (the first cell). In the first case, for a search space set (SS set B) with IDn configured in the search space set in the second cell, if there is a search space set (SS set A) with the same IDn configured in the first cell, the UE 115 is configured to monitor the PDCCH configured by the search space set (SS set B) in the first cell. It should be noted that n is a positive integer. In the second case, for a search space set (SS set B) with IDn configured in the search space set in the second cell, if there is no search space set with the same IDn configured in the first cell, the UE 115 is configured to monitor the PDCCH configured by the search space set (SS set B) in the second cell.

[0078] refer to Figure 4 , a diagram showing an example of monitoring a PDCCH of one cell among multiple cells is shown. Figure 4 As shown, cell A may correspond to the first cell (of base station 105), and cell B may correspond to the second cell (of base station 305). Figure 4In the example of , SS set ID 1 is configured in both cell A and cell B. UE 115 may monitor the PDCCH configured by SS set 1 of cell B in cell A. In addition, SS set ID 2 is configured only in cell B, and UE 115 may monitor the PDCCH configured by SS set 2 of cell B in cell B.

[0079] In some embodiments, a control resource set (CORESET) for PDCCH monitoring for the first case and the second case (as described above) may be determined. For illustration, for the first case, the CORESET associated with the SS set (SS set B) configured in the second cell may not be used to determine the resources for PDCCH monitoring in the first cell. The resources for PDCCH monitoring may be determined by the CORESET in the first cell associated with the SS set (SS set A) configured with the same ID in the first cell. For the second case, the CORESET associated with the SS set (SS set B) configured in the second cell may be used to determine the resources for PDCCH monitoring in the second cell. It should be noted that for the first case and / or the second case, the resources include the frequency bandwidth and time domain duration of consecutive symbols for PDCCH monitoring occasions. It should also be noted that if the CORESET ID (ControlResourceSetId) is included in the SS set configuration (SearchSpace), the CORESET can be associated with the SS set.

[0080] In some implementations, the network (eg, 130) may also indicate to the UE 115 the set of SS sets configured in the second cell for monitoring the PDCCH of the second cell. Other SS sets configured in cell B may be ignored.

[0081] In some implementations, the network (eg, 130 ) may also indicate to the UE 115 a set of SS sets configured in the first cell for PDCCH monitoring of the second cell (first case).

[0082] refer to Figure 5 , shows a diagram showing another example of monitoring the PDCCH of one cell among multiple cells. Figure 5 As shown, cell A may correspond to the first cell (of base station 105), and cell B may correspond to the second cell (of base station 305). Figure 5In the example of , SS set IDs 1 and 2 are configured in cell A, and the network (e.g., 130) indicates that SS set 1 is used. In addition, SS set IDs 1, 2, 3, 4 are configured in cell B, and the network (e.g., 130) indicates that SS sets 1 and 3 are used. UE 115 can monitor the PDCCH configured by SS set 1 candidates in cell A because both cell A and cell B have SS set 1. In addition, the UE monitors the PDCCH candidates of SS set 3 in cell B because the network indicates that SS set 3 is used (in addition to SS set 1 monitored in cell A). UE 115 can ignore SS sets 2 and 4 because the network does not indicate these sets to monitor the PDCCH of cell B.

[0083] In some embodiments, the SS set configured in the second cell (SS set B) is: Option A-the SS set configured in the active BWP of the second cell; or Option B-the SS set configured in any BWP (e.g., inactive BWP) of the second cell. It should be noted that the first case (as described above) and the second case may have different options. For example, the first case may have Option A or Option B, and the second case may only have Option A.

[0084] In some embodiments, the SS set configured in the first cell (SS set A) should be: Option C-SS set configured in the active BWP of the first cell; or Option D-SS set configured in any BWP (e.g., inactive BWP) of the first cell. It should be noted that the first case and the second case may have different options (between Option C and Option D). For illustration, in the first cell, by selecting Option C for the first case, PDCCH may be monitored only in the active BWP.

[0085] refer to Figure 6 , shows a schematic diagram illustrating another example of monitoring the PDCCH of one cell among multiple cells. Figure 6 As shown, cell A may correspond to the first cell (of base station 105), and cell B may correspond to the second cell (of base station 305). Figure 6, cell B has option A for the first case and the second case, and cell A has option C for the first case, and option D for the second case. Cell A has SS set 3 configured for inactive BWP in cell A, and has SS set 1 configured for active BWP in cell A. Cell B has SS sets 1, 2, 3 configured for active BWP in cell B. UE 115 does not monitor PDCCH configured in SS set 3 of cell B in cell A. For illustration, SS set 3 is in both cell A and cell B, and corresponding to the first case, should be in cell A. However, because cell A takes option C for the first case, UE 115 does not monitor SS set 3 of cell B in cell A because SS set 3 is not in the active BWP required by option C. UE 115 monitors PDCCH configured in SS set 1 of cell B in cell A because SS set 1 is in both cell A and cell B, and is in the active BWP of cell A. UE 115 monitors the PDCCH configured in SS set 2 of cell B in cell B according to the second case because SS set 2 is not in both cell A and cell B, and monitors the PDCCH configured in SS set 2 of cell B in cell B according to option A because SS set 2 is in the active BWP of cell B.

[0086] refer to Figure 7 , shows a schematic diagram illustrating another example of monitoring the PDCCH of one cell among multiple cells. Figure 7 As shown, cell A may correspond to the first cell (of base station 105), and cell B may correspond to the second cell (of base station 305). Figure 7In the example of , cell B has option A for the first case and the second case, and cell A has option C for the first case and the second case. Cell A has SS set 3 configured for inactive BWP in cell A, and has SS set 1 configured for active BWP in cell A. Cell B has SS sets 1, 2, 3 configured for active BWP in cell B. UE 115 does not monitor PDCCH configured in SS set 3 of cell B in cell A. For illustration, SS set 3 is in both cell A and cell B, and corresponding to the first case, it should be in cell A. However, because cell A takes option C in the first case, UE 115 does not monitor SS set 3 of cell B in cell A because SS set 3 is not in the active BWP required by option C. UE 115 monitors PDCCH configured in SS set 1 of cell B in cell A because SS set 1 is in both cell A and cell B, and in the active BWP of cell A. UE 115 monitors the PDCCH configured in SS set 2 of cell B in cell B according to the second case because SS set 2 is not in both cell A and cell B, and monitors the PDCCH configured in SS set 2 of cell B in cell B according to option A because SS set 2 is in the active BWP of cell B. UE 115 monitors the PDCCH configured in SS set 3 of cell B in cell B because the UE considers the active BWPs of cell A and cell B for the first and second cases. When considering the first and second cases for SS set 3, SS set 3 is not in the two active BWP cells, so UE 115 monitors the PDCCH configured in SS set 3 of cell B in cell B.

[0087] Figure 8 is a flow chart illustrating an example method performed by a UE for communication. For example, the example blocks may enable the UE to perform PDCCH monitoring according to some aspects of the present disclosure. In addition, reference will be made to Fig. 9 The UE 115 shown depicts example blocks. Fig. 9 1 is a block diagram conceptually illustrating an example design of a UE configured to perform PDCCH monitoring according to at least one aspect of the present disclosure. Figure 2 1 or 3. For example, the UE 115 includes a controller / processor 280 that operates to execute logic or computer instructions stored in a memory 282 and controls the components of the UE 115 that provide the features and functions of the UE 115. Under the control of the controller / processor 280, the UE 115 transmits and receives signals via wireless radios 501a-r and antennas 252a-r. The wireless radios 901a-r include, for example, Figure 2Various components and hardware are shown for UE 115 , including modulators / demodulators 254a - r , a MIMO detector 256 , a receive processor 258 , a transmit processor 264 , and a TX MIMO processor 266 .

[0088] As shown, the memory 282 may include DCI format information 902, SS information 903, CORESET information 904, a cross-carrier scheduler 905, and a PDCCH monitor 906. The DCI format information 902, the SS information 903, and the CORESET information 904 may include or correspond to the DCI format information 310, the SS information 311, and the CORESET information 312, respectively. The cross-carrier scheduler 905 and the PDCCH monitor 906 may include or correspond to the cross-carrier scheduler 322 and the PDCCH monitor 323, respectively. In some aspects, the cross-carrier scheduler 905, the PDCCH monitor 906, or a combination thereof may include or correspond to the processor 302. The UE 115 may receive a message from a base station (such as the base station 105, 305, or such as Figure 6 Base station 105 shown) or Figure 3 The core network 130 receives the signal and / or transmits the signal to the base station or Figure 3 The core network 130.

[0089] refer to Figure 8 , shows an example flow chart of a method 800 of UE operation for communication. As shown in block 801, the UE receives one or more search space sets for a second cell. The second cell may include or correspond to a base station 105 or a base station 305. In some embodiments, the second cell is a secondary cell (SCell). In other embodiments, the second cell is a primary cell (PCell). The PDCCH of the second cell is allowed to be monitored in multiple cells. In some embodiments, the UE 115 can receive one or more search space sets using a wireless radio device 901a-r and an antenna 252a-r.

[0090] In block 802, the UE performs a first physical downlink control channel (PDCCH) monitoring of a second cell in a first cell and performs a second PDCCH monitoring of the second cell in a second cell based on one or more search space sets. In some embodiments, the UE 115 may receive (or monitor) one or more PDCCH messages from a base station 105, 305 using a wireless radio 901a-r and an antenna 252a-r. Monitoring the PDCCH of the second cell in multiple cells allows flexible control resource utilization for carrier aggregation (CA). Additionally or alternatively, performing a first PDCCH monitoring of the second cell in the first cell and performing a second PDCCH monitoring of the second cell in the second cell may transfer control signaling of the second cell.

[0091] In some embodiments, when cross-carrier scheduling is configured for the second cell, the second cell data may be self-scheduled by one or more fallback DCIs having a DCI format (0-0, 1-0), and the second cell data may be cross-carrier scheduled by one or more non-fallback DCIs having a DCI format (0-1, 1-1) in another cell. In other embodiments, when cross-carrier scheduling is configured for the second cell: the second cell data may be cross-carrier scheduled by one or more non-fallback DCIs having a DCI format (0-1, 1-1) in another cell, and at least one other DCI is received in the second cell, the at least one other DCI including a group common (GC) DCI, a broadcast data scheduled DCI, or both.

[0092] In some implementations, the method 800 further includes: receiving, at the UE, a first PDCCH of the second cell in the first cell. Additionally or alternatively, the method 800 may further include: receiving, by the UE, a second PDCCH of the second cell in the second cell.

[0093] In some embodiments, the network configures one or more search space sets for the second cell. For example, the network may include or correspond to the core network 130. Additionally or alternatively, the network may configure one or more control resource sets (CORESETs) for monitoring the PDCCH of the second cell in multiple cells. In some such embodiments, the method 800 may include: receiving, by the UE, one or more CORESETs, wherein the one or more CORESETs are associated with the one or more search space sets.

[0094] In some embodiments, method 800 includes: at a UE, determining whether a first search space set configured in a first cell has the same ID as a second search space set configured in a second cell. Method 800 may also include: the UE, based on determining that the first search space set has the same ID as the second search space set, monitoring a PDCCH configured by the second search space set in the first cell. In some embodiments, method 800 also includes: the UE determining, based on a CORESET in the first cell associated with the first search space set, resources for first PDCCH monitoring in the first cell. In some such embodiments, the CORESET associated with the second search space set is not used to determine resources for first PDCCH monitoring.

[0095] In some embodiments, method 800 includes: at the UE, determining whether a first search space set configured in the first cell has the same ID as a second search space set configured in the second cell. Method 800 may also include: the UE, based on determining that the first search space set does not have the same ID as the second search space set, monitoring the PDCCH configured by the second search space set in the second cell. In some such embodiments, the UE determines the resources for performing the second PDCCH monitoring in the second cell based on the CORESET associated with the second search space set in the second cell. Additionally or alternatively, method 800 may include: receiving, by the UE from the network, an indication of at least one of one or more search space sets for monitoring the PDCCH of the second cell. The UE may ignore a set of one or more sets other than the at least one set. Additionally or alternatively, method 800 may include: receiving, by the UE from the network, an indication of at least one of one or more search space sets for monitoring the PDCCH of the second cell.

[0096] In some embodiments, method 800 includes: receiving, by the UE from the network, an indication of at least one search space set configured for the first cell for PDCCH monitoring of the second cell. In some such embodiments, the set of one or more search space sets configured in the second cell is configured in an active bandwidth part (BWP) of the second cell, or is configured in any BWP of the second cell. In other embodiments, the search space configured in the first cell is configured in an active bandwidth part (BWP) of the first cell. In some such embodiments, the set of one or more search space sets configured in the second cell is configured in an active bandwidth part (BWP) of the second cell. Additionally or alternatively, the search space configured in the first cell is configured in any BWP of the first cell. In some embodiments, the search space configured in the first cell is configured in an active bandwidth part (BWP) of the first cell, or is configured in any BWP of the first cell.

[0097] It should be noted that the reference Figure 8 One or more blocks (or operations) described above may be combined with one or more blocks (or operations) of another figure. Figure 8 One or more frames of another figure ( Figure 2 or Figure 3 ) is combined with one or more boxes (or operations) of Figure 1-3 One or more of the operations described may be combined with reference to Fig.10 Describes one or more combinations of operations.

[0098] Fig.10is a block diagram conceptually illustrating an example design of a base station 105 that is configured to configure a UE 115 to transmit a PDCCH message in accordance with one or more aspects of the present disclosure. Fig.10 may include or correspond to Figure 3 Base stations 105, 305.

[0099] The base station 105 includes Figure 2 or Figure 3 1. The structure, hardware, and components of the base station 105 shown in FIG. 1. For example, the base station 105 includes a controller / processor 240 that operates to execute logic or computer instructions stored in a memory 242 and to control components of the base station 105 that provide the features and functions of the base station 105. Under the control of the controller / processor 240, the base station 105 transmits and receives signals via the wireless radios 1001a-t and antennas 234a-t. The wireless radios 1001a-t include, for example, Figure 2 1. The various components and hardware shown in FIG. 105 of the base station 105 include modulators / demodulators 232a-t, transmit processor 220, TX MIMO processor 230, MIMO detector 236, and receive processor 238.

[0100] As shown, the memory 242 may include DCI format information 1002, SS information 1003, CORESET information 1004, cross-carrier scheduling information 605, and information generator 1006. The DCI format information 1002, SS information 1003, CORESET information 1004, and cross-carrier scheduling information 605 may include or correspond to DCI format information 310, SS information 311, CORESET information 312, and cross-carrier scheduling information 1005, respectively. The message generator 1006 may include or correspond to the message generator 342. In some aspects, the message generator 606 may include or correspond to the processor 302. The base station 105 may receive a UE (such as Figure 5 UE 115 shown) or Figure 3 The core network 130 receives the signal and / or transmits the signal to the UE or Figure 3 The core network 130.

[0101] It should be noted that the reference Fig.10 One or more blocks (or operations) described above may be combined with one or more blocks (or operations) of another figure. Fig.10 One or more frames of another figure ( Figure 2 or Figure 3 ) is combined with one or more boxes (or operations) of Figures 1 to 3 One or more of the operations described may be combined with reference to Fig.10 Describes one or more combinations of operations.

[0102] In some aspects, a user equipment (UE) receives one or more search space sets for the second cell. For example, the UE may receive one or more search space sets from the network. Additionally or alternatively, the UE may receive one or more search space sets for the first cell.

[0103] Additionally or alternatively, in some aspects, the UE performs a first physical downlink control channel (PDCCH) monitoring of the second cell in the first cell and / or performs a second PDCCH monitoring of the second cell in the second cell based on one or more search space sets. In some such aspects, the UE may receive a first PDCCH during the first monitoring period, a second PDCCH during the second monitoring period, or both.

[0104] Configuration and / or use of one or more search space sets for the first cell, one or more search space sets for the second cell, or both may include additional aspects, such as any single aspect or any combination of aspects described below and / or in combination with one or more other process descriptions described elsewhere herein.

[0105] In a first aspect, a UE performs first physical downlink control channel (PDCCH) monitoring of a second cell in a first cell and performs second PDCCH monitoring of the second cell in the second cell based on one or more search space sets.

[0106] On the second aspect, alone or in combination with the first aspect, when cross-carrier scheduling is configured for the second cell: the second cell data can be self-scheduled by one or more fallback DCIs having a DCI format (0-0, 1-0), and / or the second cell data can be cross-carrier scheduled by one or more non-fallback DCIs having a DCI format (0-1, 1-1) in another cell.

[0107] In a third aspect, alone or in combination with the second aspect, the second cell includes a secondary cell (SCell).

[0108] In the fourth aspect, alone or in combination with one or more of the first or second aspects, when cross-carrier scheduling is configured for the second cell: the second cell data may be cross-carrier scheduled by one or more non-fallback DCIs having a DCI format (0-1, 1-1) in another cell, and / or at least one other DCI is received in the second cell, the at least one other DCI including a group common (GC) DCI, a broadcast data scheduled DCI, or both.

[0109] In a fifth aspect, alone or in combination with the fourth aspect, the second cell comprises a primary cell (PCell).

[0110] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, monitoring a PDCCH of a second cell among a plurality of cells allows for flexible control resource utilization of carrier aggregation (CA).

[0111] In the seventh aspect, alone or in combination with one or more of the first to sixth aspects, first PDCCH monitoring of the second cell is performed in the first cell and second PDCCH monitoring of the second cell is performed in the second cell to transfer control signaling of the second cell.

[0112] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, the UE receives a first PDCCH of a second cell in a first cell. Additionally or alternatively, the UE receives a second PDCCH of the second cell in the second cell.

[0113] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, the network configures one or more search space sets of the second cell.

[0114] In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, the network configures one or more control resource sets (CORESET) for monitoring a PDCCH of a second cell in a plurality of cells.

[0115] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, the UE receives one or more CORESETs. The one or more CORESETs may be associated with one or more search space sets.

[0116] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the UE determines whether a first search space set configured in a first cell has an ID identical to a second search space set configured in a second cell. Additionally or alternatively, the UE monitors a PDCCH configured by the second search space set in the first cell based on determining that the first search space set has the same ID as the second search space set.

[0117] In a thirteenth aspect, in combination with the twelfth aspect, the UE determines resources for performing a first PDCCH monitoring in the first cell based on a CORESET associated with a first search space set in the first cell.

[0118] In a fourteenth aspect, alone or in combination with one or more of the eleventh aspect or the twelfth aspect, a CORESET associated with the second search space set is not used to determine resources for first PDCCH monitoring.

[0119] In a fifteenth aspect, alone or in combination with one or more of the first to eleventh aspects, the UE determines whether a first search space set configured in a first cell has an ID identical to a second search space set configured in a second cell. Additionally or alternatively, the UE monitors a PDCCH configured by the second search space set in the second cell based on determining that the first search space set does not have the same ID as the second search space set.

[0120] In a sixteenth aspect, in combination with the fifteenth aspect, the UE determines resources for performing a second PDCCH monitoring in the second cell based on a CORESET associated with a second search space set in the second cell.

[0121] In a seventeenth aspect, alone or in combination with one or more of the first to sixteenth aspects, the UE receives from the network an indication of at least one of one or more search space sets for monitoring the PDCCH of the second cell.

[0122] In an eighteenth aspect, in combination with the seventeenth aspect, the UE ignores a set of one or more sets other than the at least one set.

[0123] In a nineteenth aspect, alone or in combination with one or more of the first to eighteenth aspects, the UE receives an indication from a network of at least one search space set configured for a first cell for PDCCH monitoring of a second cell.

[0124] In a twentieth aspect, in combination with the twelfth aspect, the set of one or more search space sets configured in the second cell is configured in an active bandwidth part (BWP) of the second cell, or is configured in any BWP of the second cell.

[0125] In a twenty-first aspect, in combination with the twelfth aspect or the twentieth aspect, the search space configured in the first cell is configured in an active bandwidth part (BWP) of the first cell.

[0126] In a twenty-second aspect, in combination with the fifteenth aspect, the set of one or more search space sets configured in the second cell is configured in an active bandwidth part (BWP) of the second cell.

[0127] In the twenty-third aspect, in combination with the fifteenth aspect or the twenty-second aspect, the search space configured in the first cell is configured in any BWP of the first cell.

[0128] In a twenty-fourth aspect, alone or in combination with one or more of the first to eighteenth aspects, the search space configured in the first cell is configured in an active bandwidth part (BWP) of the first cell, or is configured in any BWP of the first cell.

[0129] Those skilled in the art will appreciate that information and signals may be represented by any of a variety of different techniques and technologies. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be mentioned throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or optical particles, or any combination thereof.

[0130] The functional blocks and modules described herein (eg, Figure 2 The functional blocks and modules therein may include processors, electronic devices, hardware devices, electronic components, logical circuits, memories, software codes, firmware codes, etc., or any combination thereof.

[0131] Skilled artisans will further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps (e.g., Figure 8 The boxes in ( ) can be implemented as electronic hardware, computer software, or a combination of the two. In order to clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been generally described above in terms of their functions. Whether such functions are implemented as hardware or software depends on the specific application and the design constraints imposed on the entire system. The technician can implement the described functions in different ways for each specific application, but the decision of such implementation should not be interpreted as departing from the scope of the present disclosure. The technician will also easily recognize that the order or combination of components, methods, or interactions described herein are only examples, and the components, methods, or interactions of various aspects of the present disclosure can be combined or performed in a manner different from that shown and described herein.

[0132] The various illustrative logical blocks, modules, and circuits described in conjunction with the disclosure herein may be implemented or performed with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in other cases, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors combined with a DSP core, or any other such configuration.

[0133] The steps of the method or algorithm described in conjunction with the disclosure of this article can be directly embodied in hardware, in a software module executed by a processor, or in a combination of the two. The software module can reside in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. In other cases, the storage medium can be integrated into the processor. The processor and the storage medium can reside in an ASIC. The ASIC can reside in a user terminal. In other cases, the processor and the storage medium can reside in a user terminal as discrete components.

[0134] In one or more exemplary designs, the functions described can be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions can be stored on a computer-readable medium or transmitted on a computer-readable medium as one or more instructions or codes. Computer-readable media include both computer storage media and communication media, including any medium that is convenient for transferring a computer program from one place to another. Computer-readable storage media can be any available medium that can be accessed by a general or special computer. For example (but not limitation), such computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage device or other magnetic storage device, or any other medium that can be used to carry or store the desired program code device (means) in the form of an instruction or data structure and can be accessed by a general or special computer or a general or special processor. In addition, the connection can be appropriately referred to as a computer-readable medium. For example, if the software is transmitted from a website, a server, or other remote source using a coaxial cable, a fiber optic cable, a twisted pair, or a digital subscriber line (DSL), the coaxial cable, the fiber optic cable, the twisted pair, or the DSL are included in the definition of the medium. As used herein, disk and disc include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), hard disk, solid state disk and Blu-ray disc, wherein disks usually copy data magnetically, while discs copy data optically with lasers. Combinations of the above should also be included in the scope of computer-readable media.

[0135] As used herein, including in the claims, the term "and / or," when used in a list of two or more items, means that any one of the listed items may be employed by itself, or any combination of two or more of the listed items may be employed. For example, if a composition is described as comprising ingredients A, B, and / or C, the composition may: comprise A alone; comprise B alone; comprise C alone; comprise a combination of A and B; comprise a combination of A and C; comprise a combination of B and C; or comprise a combination of A, B, and C. Furthermore, as used herein, including in the claims, "or" used in a list of items beginning with "at least one" indicates a disjunctive list, for example, a list of "at least one of A, B, or C" means any one of A or B or C or AB or AC or BC or ABC (i.e., A and B and C) or any combination thereof.

[0136] The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Therefore, the disclosure is not limited to the examples and designs described herein, but should be given the broadest scope consistent with the principles and novel features disclosed herein.

[0137]

[0138]

[0139]

[0140]

[0141]

[0142]

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[0146]

Claims

1. A method of wireless communication, comprising: Receiving, by a user equipment UE, one or more search space sets of a second cell; as well as The UE performs, in the first cell, first physical downlink control channel (PDCCH) monitoring of the second cell based on one or more search space sets, and performs, in the second cell, second PDCCH monitoring of the second cell, and the method further includes: At the UE, determining whether a first search space set configured in the first cell has the same ID as a second search space set configured in the second cell; as well as The PDCCH configured by the second search space set is monitored in the first cell by the UE based on determining that the first search space set has the same ID as the second search space set.

2. The method according to claim 1, wherein: The PDCCH of the second cell is allowed to be monitored in multiple cells.

3. The method according to any one of claims 1 to 2, wherein: When cross-carrier scheduling is configured for the second cell: The second cell data may be self-scheduled by one or more fallback DCIs having DCI format 0-0 or DCI format 1-0; as well as The second cell data may be cross-carrier scheduled by one or more non-fallback DCIs having DCI format 0-1 or DCI format 1-1 in another cell.

4. The method according to claim 3, wherein: The second cell includes a secondary cell SCell.

5. The method according to any one of claims 1 to 2, wherein: When cross-carrier scheduling is configured for the second cell: The second cell data may be cross-carrier scheduled by one or more non-fallback DCIs having DCI format 0-1 or DCI format 1-1 in another cell; as well as At least one other DCI is received in the second cell, the at least one other DCI comprising a group common GC DCI, a broadcast data scheduled DCI, or both.

6. The method according to claim 5, wherein: The second cell includes a primary cell PCell.

7. The method according to any one of claims 1 to 2, wherein: Monitoring the PDCCH of the second cell among multiple cells allows flexible control resource utilization for carrier aggregation CA.

8. The method according to any one of claims 1 to 2, wherein: The first PDCCH monitoring of the second cell performed in the first cell and the second PDCCH monitoring of the second cell performed in the second cell transfer control signaling of the second cell.

9. The method according to any one of claims 1 to 2, further comprising: At the UE, receiving, in the first cell, a first PDCCH of the second cell; as well as A second PDCCH of the second cell is received by the UE in the second cell.

10. The method according to any one of claims 1 to 2, wherein: The network configures one or more search space sets for the second cell.

11. The method according to any one of claims 1 to 2, wherein: The network configures one or more control resource sets CORESET for monitoring the PDCCH of the second cell in multiple cells.

12. The method according to any one of claims 1 to 2, further comprising: Receiving one or more CORESETs by the UE; as well as The one or more CORESETs are associated with one or more search space sets.

13. The method according to claim 1, further comprising: The UE determines resources for performing first PDCCH monitoring in the first cell based on the CORESET associated with the first search space set in the first cell.

14. The method according to any one of claims 1 to 2, wherein: The CORESET associated with the second search space set is not used to determine resources for the first PDCCH monitoring.

15. The method according to any one of claims 1 to 2, further comprising: At the UE, determining whether a first search space set configured in the first cell has the same ID as a second search space set configured in the second cell; as well as Monitoring, by the UE, a PDCCH configured by the second search space set in the second cell based on determining that the first search space set does not have the same ID as the second search space set.

16. The method according to claim 15, further comprising: At the UE, based on the CORESET associated with the second search space set in the second cell, resources for performing second PDCCH monitoring in the second cell are determined.

17. The method according to any one of claims 1 to 2, further comprising: An indication of at least one of the one or more search space sets for monitoring a PDCCH of a second cell is received by the UE from the network.

18. The method according to claim 17, further comprising: A set of one or more sets other than the at least one set is ignored by the UE.

19. The method according to any one of claims 1 to 2, further comprising: An indication of at least one search space set configured for the first cell is received by the UE from the network for PDCCH monitoring of the second cell.

20. The method of claim 1, wherein: The set of one or more search space sets configured in the second cell is configured in the active bandwidth part BWP of the second cell, or is configured in any BWP of the second cell.

21. The method according to claim 1 or 20, wherein: The search space configured in the first cell is configured in the active bandwidth part BWP of the first cell.

22. The method of claim 15, wherein: The set of one or more search space sets configured in the second cell is configured in the active bandwidth part BWP of the second cell.

23. The method of claim 15, wherein: The search space configured in the first cell is configured in any BWP of the first cell.

24. The method according to any one of claims 1 to 2, wherein: The search space configured in the first cell is configured in the active bandwidth part BWP of the first cell, or is configured in any BWP of the first cell.

25. An apparatus configured for wireless communication, comprising: A device for receiving, by a user equipment UE, one or more search space sets of a second cell; Device, which is used for performing, by a UE, first physical downlink control channel (PDCCH) monitoring of a second cell in a first cell based on one or more search space sets, and performing second PDCCH monitoring of the second cell in the second cell A device for determining whether a first search space set configured in a first cell has the same ID as a second search space set configured in a second cell; and A device for monitoring a PDCCH configured by a second search space set in a first cell based on determining that the first search space set has the same ID as the second search space set.

26. The device according to claim 25, wherein The PDCCH of the second cell is allowed to be monitored in multiple cells.

27. The device according to any one of claims 25 to 26, wherein: When cross-carrier scheduling is configured for the second cell: The second cell data may be self-scheduled by one or more fallback DCIs having DCI format 0-0 or DCI format 1-0; as well as The second cell data may be cross-carrier scheduled by one or more non-fallback DCIs having DCI format 0-1 or DCI format 1-1 in another cell.

28. The device according to claim 27, wherein The second cell includes a secondary cell SCell.

29. The device according to any one of claims 25 to 26, wherein: When cross-carrier scheduling is configured for the second cell: The second cell data may be cross-carrier scheduled by one or more non-fallback DCIs having DCI format 0-1 or DCI format 1-1 in another cell; as well as At least one other DCI is received in the second cell, the at least one other DCI comprising a group common GC DCI, a broadcast data scheduled DCI, or both.

30. The device according to claim 29, wherein: The second cell includes a primary cell PCell.

31. The device according to any one of claims 25 to 26, wherein: Monitoring the PDCCH of the second cell among multiple cells allows flexible control resource utilization for carrier aggregation CA.

32. The device according to any one of claims 25 to 26, wherein: The first PDCCH monitoring of the second cell performed in the first cell and the second PDCCH monitoring of the second cell performed in the second cell transfer control signaling of the second cell.

33. The apparatus according to any one of claims 25 to 26, further comprising: A device, configured to receive, in a first cell, a first PDCCH of a second cell; and A device is used to receive a second PDCCH of a second cell in a second cell.

34. The device according to any one of claims 25 to 26, wherein: The network configures one or more search space sets for the second cell.

35. The device according to any one of claims 25 to 26, wherein: The network configures one or more control resource sets CORESET for monitoring the PDCCH of the second cell in multiple cells.

36. The apparatus according to any one of claims 25 to 26, further comprising: A device for receiving one or more CORESETs; as well as The one or more CORESETs are associated with one or more search space sets.

37. The apparatus of claim 25, further comprising: A device is used to determine resources for performing first PDCCH monitoring in the first cell based on a CORESET associated with a first search space set in the first cell.

38. The device according to any one of claims 25 to 26, wherein: The CORESET associated with the second search space set is not used to determine resources for the first PDCCH monitoring.

39. The apparatus according to any one of claims 25 to 26, further comprising: A device for determining whether a first search space set configured in a first cell has the same ID as a second search space set configured in a second cell; and A device for monitoring a PDCCH configured by a second search space set in a second cell based on determining that the first search space set does not have the same ID as the second search space set.

40. The apparatus of claim 39, further comprising: A device is used to determine resources for performing second PDCCH monitoring in the second cell based on a CORESET associated with a second search space set in the second cell.

41. The apparatus according to any one of claims 25 to 26, further comprising: Means for receiving, from a network, an indication of at least one of one or more search space sets for monitoring a PDCCH of a second cell.

42. The apparatus of claim 41, further comprising: Means for ignoring a collection of one or more sets other than the at least one set.

43. The apparatus according to any one of claims 25 to 26, further comprising: A device for receiving from a network an indication of at least one search space set configured for a first cell for PDCCH monitoring of a second cell.

44. The apparatus of claim 25, wherein: The set of one or more search space sets configured in the second cell is configured in the active bandwidth part BWP of the second cell, or is configured in any BWP of the second cell.

45. The apparatus of claim 25 or 44, wherein: The search space configured in the first cell is configured in the active bandwidth part BWP of the first cell.

46. ​​The apparatus of claim 39, wherein: The set of one or more search space sets configured in the second cell is configured in the active bandwidth part BWP of the second cell.

47. The apparatus of claim 39, wherein: The search space configured in the first cell is configured in any BWP of the first cell.

48. The device according to any one of claims 25 to 26, wherein: The search space configured in the first cell is configured in the active bandwidth part BWP of the first cell, or is configured in any BWP of the first cell.

49. A non-transitory computer readable medium having program code recorded thereon, the program code being executable by a computer to cause the computer to: Receiving, by a user equipment UE, one or more search space sets of a second cell; as well as The UE performs, in the first cell, first physical downlink control channel (PDCCH) monitoring of the second cell based on the one or more search space sets, and performs, in the second cell, second PDCCH monitoring of the second cell, in, The program code can also be executed by a computer to cause the computer to: At the UE, determining whether a first search space set configured in the first cell has the same ID as a second search space set configured in the second cell; as well as The PDCCH configured by the second search space set is monitored in the first cell by the UE based on determining that the first search space set has the same ID as the second search space set.

50. The non-transitory computer readable medium of claim 49, wherein: The PDCCH of the second cell is allowed to be monitored in multiple cells.

51. The non-transitory computer readable medium of any one of claims 49 to 50, wherein: When cross-carrier scheduling is configured for the second cell: The second cell data may be self-scheduled by one or more fallback DCIs having DCI format 0-0 or DCI format 1-0; as well as The second cell data may be cross-carrier scheduled by one or more non-fallback DCIs having DCI format 0-1 or DCI format 1-1 in another cell.

52. The non-transitory computer readable medium of claim 51, wherein: The second cell includes a secondary cell SCell.

53. The non-transitory computer readable medium of any one of claims 49 to 50, wherein: When cross-carrier scheduling is configured for the second cell: The second cell data may be cross-carrier scheduled by one or more non-fallback DCIs having DCI format 0-1 or DCI format 1-1 in another cell; as well as At least one other DCI is received in the second cell, the at least one other DCI comprising a group common GC DCI, a broadcast data scheduled DCI, or both.

54. The non-transitory computer readable medium of claim 53, wherein: The second cell includes a primary cell PCell.

55. The non-transitory computer readable medium of any one of claims 49 to 50, wherein: Monitoring the PDCCH of the second cell among multiple cells allows flexible control resource utilization for carrier aggregation CA.

56. The non-transitory computer readable medium of any one of claims 49 to 50, wherein: The first PDCCH monitoring of the second cell performed in the first cell and the second PDCCH monitoring of the second cell performed in the second cell transfer control signaling of the second cell.

57. The non-transitory computer readable medium of any one of claims 49 to 50, wherein: The program code may also be executed by a computer to cause the computer to: At the UE, receiving, in the first cell, a first PDCCH of the second cell; and A second PDCCH of the second cell is received by the UE in the second cell.

58. The non-transitory computer readable medium of any one of claims 49 to 50, wherein: The network configures one or more search space sets for the second cell.

59. The non-transitory computer readable medium of any one of claims 49 to 50, wherein: The network configures one or more control resource sets CORESET for monitoring the PDCCH of the second cell in multiple cells.

60. The non-transitory computer readable medium of any one of claims 49 to 50, wherein: The program code may also be executed by a computer to cause the computer to: Receiving, by the UE, one or more CORESETs; and The one or more CORESETs are associated with one or more search space sets.

61. The non-transitory computer readable medium of claim 49, wherein: The program code may also be executed by a computer to cause the computer to: At the UE, based on the CORESET associated with the first search space set in the first cell, resources for performing first PDCCH monitoring in the first cell are determined.

62. The non-transitory computer readable medium of any one of claims 49 to 50, wherein: The CORESET associated with the second search space set is not used to determine resources for the first PDCCH monitoring.

63. The non-transitory computer readable medium of any one of claims 49 to 50, wherein: The program code may also be executed by a computer to cause the computer to: At the UE, determining whether a first search space set configured in the first cell has the same ID as a second search space set configured in the second cell; as well as Monitoring, by the UE, a PDCCH configured by the second search space set in the second cell based on determining that the first search space set does not have the same ID as the second search space set.

64. The non-transitory computer readable medium of claim 63, wherein: The program code may also be executed by a computer to cause the computer to: At the UE, based on the CORESET associated with the second search space set in the second cell, resources for performing second PDCCH monitoring in the second cell are determined.

65. The non-transitory computer readable medium of any one of claims 49 to 50, wherein: The program code may also be executed by a computer to cause the computer to: An indication of at least one of the one or more search space sets for monitoring a PDCCH of a second cell is received by the UE from the network.

66. The non-transitory computer readable medium of claim 65, wherein: The program code may also be executed by a computer to cause the computer to: A set of one or more sets other than the at least one set is ignored by the UE.

67. The non-transitory computer readable medium of any one of claims 49 to 50, wherein: The program code may also be executed by a computer to cause the computer to: An indication of at least one search space set configured for the first cell is received by the UE from the network for PDCCH monitoring of the second cell.

68. The non-transitory computer readable medium of claim 49, wherein: The set of one or more search space sets configured in the second cell is configured in the active bandwidth part BWP of the second cell, or is configured in any BWP of the second cell.

69. The non-transitory computer readable medium of claim 49 or 68, wherein: The search space configured in the first cell is configured in the active bandwidth part BWP of the first cell.

70. The non-transitory computer readable medium of claim 63, wherein: The set of one or more search space sets configured in the second cell is configured in the active bandwidth part BWP of the second cell.

71. The non-transitory computer readable medium of claim 63, wherein: The search space configured in the first cell is configured in any BWP of the first cell.

72. The non-transitory computer readable medium of any one of claims 49 to 50, wherein: The search space configured in the first cell is configured in the active bandwidth part BWP of the first cell, or is configured in any BWP of the first cell.

73. An apparatus configured for wireless communication, the apparatus comprising: at least one processor; and a memory coupled to the at least one processor, Wherein, the at least one processor is configured to: Receiving, by a user equipment UE, one or more search space sets of a second cell; and The UE performs, in the first cell, first physical downlink control channel (PDCCH) monitoring of the second cell based on one or more search space sets, and performs, in the second cell, second PDCCH monitoring of the second cell, Wherein, the at least one processor is further configured to: determining whether a first search space set configured in the first cell has the same ID as a second search space set configured in the second cell; and A PDCCH configured by the second search space set is monitored in the first cell based on determining that the first search space set has the same ID as the second search space set.

74. The apparatus of claim 73, wherein: The PDCCH of the second cell is allowed to be monitored in multiple cells.

75. The device according to any one of claims 73 to 74, wherein: When cross-carrier scheduling is configured for the second cell: The second cell data may be self-scheduled by one or more fallback DCIs having DCI format 0-0 or DCI format 1-0; as well as The second cell data may be cross-carrier scheduled by one or more non-fallback DCIs having DCI format 0-1 or DCI format 1-1 in another cell.

76. The apparatus of claim 75, wherein: The second cell includes a secondary cell SCell.

77. The device according to any one of claims 73 to 74, wherein: When cross-carrier scheduling is configured for the second cell: The second cell data may be cross-carrier scheduled by one or more non-fallback DCIs having DCI format 0-1 or DCI format 1-1 in another cell; as well as At least one other DCI is received in the second cell, the at least one other DCI comprising a group common GC DCI, a broadcast data scheduled DCI, or both.

78. The apparatus of claim 77, wherein: The second cell includes a primary cell PCell.

79. The device according to any one of claims 73 to 74, wherein Monitoring the PDCCH of the second cell among multiple cells allows flexible control resource utilization for carrier aggregation CA.

80. The device according to any one of claims 73 to 74, wherein: The first PDCCH monitoring of the second cell performed in the first cell and the second PDCCH monitoring of the second cell performed in the second cell transfer control signaling of the second cell.

81. The device according to any one of claims 73 to 74, wherein The at least one processor is further configured to: receiving, in the first cell, a first PDCCH of the second cell; and A second PDCCH of the second cell is received in the second cell.

82. The device according to any one of claims 73 to 74, wherein: The network configures one or more search space sets for the second cell.

83. The device according to any one of claims 73 to 74, wherein: The network configures one or more control resource sets CORESET for monitoring the PDCCH of the second cell in multiple cells.

84. The device of any one of claims 73 to 74, wherein: The at least one processor is further configured to: Receiving, by the UE, one or more CORESETs; and The one or more CORESETs are associated with one or more search space sets.

85. The apparatus of claim 73, wherein: The at least one processor is further configured to: Based on the CORESET associated with the first search space set in the first cell, resources for performing first PDCCH monitoring in the first cell are determined.

86. The device of any one of claims 73 to 74, wherein: The CORESET associated with the second search space set is not used to determine resources for the first PDCCH monitoring.

87. The device according to any one of claims 73 to 74, wherein The at least one processor is further configured to: determining whether a first search space set configured in the first cell has the same ID as a second search space set configured in the second cell; as well as Based on determining that the first search space set does not have the same ID as the second search space set, a PDCCH configured by the second search space set is monitored in the second cell.

88. The apparatus of claim 87, wherein: The at least one processor is further configured to: Based on the CORESET associated with the second search space set in the second cell, resources for performing second PDCCH monitoring in the second cell are determined.

89. The device according to any one of claims 73 to 74, wherein The at least one processor is further configured to: An indication of at least one of the one or more search space sets for monitoring the PDCCH of the second cell is received from the network.

90. The apparatus of claim 89, wherein: The at least one processor is further configured to: A collection of one or more sets other than the at least one set is ignored.

91. The device according to any one of claims 73 to 74, wherein: The at least one processor is further configured to: An indication of at least one search space set configured for the first cell for PDCCH monitoring of the second cell is received from the network.

92. The apparatus of claim 73, wherein: The set of one or more search space sets configured in the second cell is configured in the active bandwidth part BWP of the second cell, or is configured in any BWP of the second cell.

93. The apparatus of claim 73 or 92, wherein: The search space configured in the first cell is configured in the active bandwidth part BWP of the first cell.

94. The apparatus of claim 87, wherein: The set of one or more search space sets configured in the second cell is configured in the active bandwidth part BWP of the second cell.

95. The apparatus of claim 87, wherein: The search space configured in the first cell is configured in any BWP of the first cell.

96. The device of any one of claims 73 to 74, wherein: The search space configured in the first cell is configured in the active bandwidth part BWP of the first cell, or is configured in any BWP of the first cell.

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