CN117136521A - Cross-carrier scheduling - Google Patents

Abstract

The base station may configure a first threshold indicating a maximum number of Blind Decodes (BD) and non-overlapping Control Channel Elements (CCEs) for Physical Downlink Control Channel (PDCCH) candidates on a primary cell (PCell)/primary secondary cell (PSCell), and transmit to a User Equipment (UE) a configuration of PDCCH candidates in a Common Search Space (CSS) or user specific search space (USS) on the PCell/PSCell and USS on a secondary cell (SCell) for scheduling PDCCHs for data of the PCell/PSCell. The base station may transmit at least one PDCCH among the PDCCH candidates. The UE may receive the configuration and receive the PDCCH by blindly decoding the PDCCH candidate in at least one of a CSS or USS configured on the PCell/PSCell and a USS configured on the SCell. USS configured on PCell/PSCell may support PDCCH oversubscription.

Description

Cross-carrier scheduling

Cross Reference to Related Applications

The present application claims the benefit and priority of U.S. provisional application S/n.63/169,486 entitled "METHOD AND APPARATUS FOR CROSS-CARRIER SCHEDULING (method and apparatus for CROSS-carrier scheduling)" filed on month 1 of 2021 and U.S. patent application No.17/654,390 entitled "CROSS-CARRIER SCHEDULING (CROSS-carrier scheduling)" filed on month 3 of 2022, both of which are expressly incorporated herein by reference in their entirety.

Technical Field

The present disclosure relates generally to communication systems, and more particularly to wireless communication methods using cross-carrier scheduling.

Introduction to the invention

Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcast. A typical wireless communication system may employ multiple-access techniques capable of supporting communication with multiple users by sharing the available system resources. Examples of such multiple-access techniques include Code Division Multiple Access (CDMA) systems, time Division Multiple Access (TDMA) systems, frequency Division Multiple Access (FDMA) systems, orthogonal Frequency Division Multiple Access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, and time division-synchronous code division multiple access (TD-SCDMA) systems.

These multiple access techniques have been adopted in various telecommunications standards to provide a common protocol that enables different wireless devices to communicate at the urban, national, regional, and even global levels. An example telecommunications standard is 5G New Radio (NR). The 5G NR is part of the continuous mobile broadband evolution promulgated by the third generation partnership project (3 GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with the internet of things (IoT)) and other requirements. The 5G NR includes services associated with enhanced mobile broadband (emmbb), large-scale machine type communication (emtc), and ultra-reliable low latency communication (URLLC). Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard. There is a need for further improvements in 5G NR technology. These improvements are also applicable to other multiple access techniques and telecommunication standards employing these techniques.

Brief summary of the invention

The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

In an aspect of the disclosure, a method, computer-readable medium, and apparatus are provided. The apparatus may include a base station and a User Equipment (UE). The base station may configure a first threshold indicating a first maximum number of Blind Decodes (BD) for Physical Downlink Control Channel (PDCCH) candidates on a first cell and a second threshold indicating a second maximum number of non-overlapping Control Channel Elements (CCEs) for the PDCCH candidates; transmitting to the UE a configuration of one or more PDCCH candidates for one or more Common Search Spaces (CSSs) configured on a first cell and one or more user-specific search spaces (USSs) configured on a second cell, the configuration for a PDCCH including scheduling data for the first cell, the first cell including at least one of a primary cell (PCell) or a primary secondary cell (PSCell), and the second cell including a secondary cell (SCell); and transmitting at least one PDCCH to the UE for a PDCCH including scheduling for the first cell based on the configuration and within a scheduled cell limit including a total number of BDs and non-overlapping CCEs for the PDCCH candidates, at least one of the one or more CSSs or the one or more USSs configured on the first cell, and one or more PDCCH candidates of the one or more USSs configured on the second cell.

The UE may receive, from a base station, a configuration for one or more CSSs configured on a first cell and one or more PDCCH candidates configured in one or more USS on a second cell, the configuration for a PDCCH including scheduling data for the first cell; and performing blind decoding of the one or more PDCCH candidates in at least one of the one or more CSSs or the one or more USSs on the first cell and the one or more USSs on the second cell based on the configuration and within the scheduled cell limit comprising BD for PDCCH candidates and the total number of non-overlapping CCEs.

In some aspects, the UE may report to the base station a parameter indicating PDCCH blind decoding capability for CA supported by the UE, and the base station may set the scheduled cell limit to be less than or equal to the PDCCH blind decoding capability supported by the UE indicated by the parameter. In one aspect, the scheduled cell restriction may be based on a smaller SCS or the same SCS associated with the first cell or the second cell. In another aspect, the scheduled cell restriction has a value less than or equal to the CA restriction of the first cell and the second cell.

The UE may receive a PDCCH in one or more PDCCH candidates and, based on the PDCCH, receive a Physical Downlink Shared Channel (PDSCH) from or transmit a Physical Uplink Shared Channel (PUSCH) to a base station on a first cell. The UE may perform blind decoding of the one or more CSSs on the first cell and the one or more USSs on the first cell within the first threshold and the second threshold.

In some aspects, a first threshold indicating a first maximum number of BDs for CSSs on a first cell and a second threshold indicating a second maximum number of non-overlapping CCEs for the CSSs may be based on a time slot having a highest number of BDs and non-overlapping CCEs for the CSSs, a third maximum number of BDs for USSs on a second cell may be based on a scheduled cell restriction minus the first threshold, and a fourth maximum number of non-overlapping CCEs for the USSs on the second cell may be based on the scheduled cell restriction minus the second threshold.

In one aspect, the configuration may further include one or more PDCCH candidates in one or more USS configured on the first cell, and wherein the method further comprises receiving an indication of a first threshold indicating a first maximum number of BDs for the PDCCH candidates on the first cell and a second threshold indicating a second maximum number of non-overlapping CCEs for the PDCCH candidates from the base station. The base station may transmit the first threshold and the second threshold via RRC messages.

In a certain aspect, the third threshold for the third maximum BD number and the fourth threshold for the fourth maximum non-overlapping CCE number of CSSs on the first cell may be based on the time slot with the highest number of BDs and non-overlapping CCEs for these CSSs, and the first threshold may have a value greater than or equal to the third threshold and the second threshold may have a value greater than or equal to the fourth threshold.

In one aspect, a base station may schedule at least one of a first USS configured on a first cell to exceed and be within a first threshold and a second threshold of the first cell. The UE may determine that at least one of the first USSs configured on the first cell is scheduled to exceed a first threshold or a second threshold of the first cell, and determine not to monitor PDCCH candidates for the at least one of the first USSs scheduled to exceed the first threshold and the second threshold.

In some aspect, the UE may transmit an indication of supporting one or more USSs on the first cell and the base station may receive the indication of supporting the one or more USSs on the first cell. The configuration for the one or more USSs on the first cell may be based on the UE supporting the one or more USSs on the first cell.

To the accomplishment of the foregoing and related ends, the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed and the present description is intended to include all such aspects and their equivalents.

Brief Description of Drawings

Fig. 1 is a diagram illustrating an example of a wireless communication system and an access network in accordance with various aspects of the present disclosure.

Fig. 2A is a diagram illustrating an example of a first frame in accordance with aspects of the present disclosure.

Fig. 2B is a diagram illustrating an example of DL channels within a subframe according to various aspects of the present disclosure.

Fig. 2C is a diagram illustrating an example of a second frame in accordance with aspects of the present disclosure.

Fig. 2D is a diagram illustrating an example of UL channels within a subframe in accordance with various aspects of the present disclosure.

Fig. 3 is a diagram illustrating an example of a base station and a User Equipment (UE) in an access network.

Fig. 4 is an example configuration of cross-carrier scheduling for a wireless communication method.

Fig. 5 is an example of a cross-slot BD for cross-carrier scheduling of a wireless communication method.

Fig. 6 is an example configuration of cross-carrier scheduling for a wireless communication method.

Fig. 7 is an example of a cross-slot BD for cross-carrier scheduling of a wireless communication method.

Fig. 8 is a communication diagram of a wireless communication method.

Fig. 9 is a flow chart of a method of wireless communication.

Fig. 10 is a flow chart of a method of wireless communication.

Fig. 11 is a flow chart of a wireless communication method.

Fig. 12 is a flow chart of a method of wireless communication.

Fig. 13 is a diagram illustrating an example of a hardware implementation of an example device.

Fig. 14 is a diagram illustrating an example of a hardware implementation of an example device.

Detailed Description

The detailed description set forth below in connection with the appended drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of the various concepts. It will be apparent, however, to one skilled in the art that these concepts may be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form in order to avoid obscuring such concepts.

Several aspects of the telecommunications system will now be presented with reference to various apparatus and methods. These apparatus and methods will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

As an example, an element, or any portion of an element, or any combination of elements, may be implemented as a "processing system" that includes one or more processors. Examples of processors include: microprocessors, microcontrollers, graphics Processing Units (GPUs), central Processing Units (CPUs), application processors, digital Signal Processors (DSPs), reduced Instruction Set Computing (RISC) processors, system on a chip (SoC), baseband processors, field Programmable Gate Arrays (FPGAs), programmable Logic Devices (PLDs), state machines, gate logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionalities described throughout this disclosure. One or more processors in the processing system may execute the software. Software should be construed broadly to mean instructions, instruction sets, code segments, program code, programs, subroutines, software components, applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether described in software, firmware, middleware, microcode, hardware description language, or other terminology.

Accordingly, in one or more example embodiments, the described functionality may be implemented in hardware, software, or any combination thereof. If implemented in software, the functions may be stored on or encoded on a computer-readable medium as one or more instructions or code. Computer readable media includes computer storage media. A storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise Random Access Memory (RAM), read-only memory (ROM), electrically Erasable Programmable ROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of these types of computer-readable media, or any other medium that can be used to store computer-executable code in the form of instructions or data structures that can be accessed by a computer.

While aspects and implementations are described in this disclosure by way of illustration of some examples, those skilled in the art will appreciate that additional implementations and use cases may be produced in many different arrangements and scenarios. Aspects described herein may be implemented across many different platform types, devices, systems, shapes, sizes, and packaging arrangements. For example, implementations and/or uses may be generated via integrated chip implementations and other non-module component-based devices (e.g., end user devices, vehicles, communication devices, computing devices, industrial equipment, retail/shopping devices, medical devices, artificial Intelligence (AI) enabled devices, etc.). While some examples may or may not be specific to each use case or application, broad applicability of the described aspects may occur. Aspects of implementations may range from chip-level or module components to non-module, non-chip-level implementations, and further to aggregated, distributed or Original Equipment Manufacturer (OEM) devices or systems incorporating one or more aspects of the described innovations. In some practical environments, devices incorporating the described aspects and features may also include additional components and features for implementing and practicing the claimed and described aspects. For example, the transmission and reception of wireless signals must include several components (e.g., hardware components including antennas, RF chains, power amplifiers, modulators, buffers, processors, interleavers, adders/summers, etc.) for analog and digital purposes. The aspects described herein are intended to be practiced in a wide variety of devices, chip-level components, systems, distributed arrangements, aggregated or disaggregated components, end-user devices, etc., of various sizes, shapes, and configurations.

Fig. 1 is a diagram illustrating an example of a wireless communication system and an access network 100. A wireless communication system, also known as a Wireless Wide Area Network (WWAN), includes a base station 102, a UE 104, an Evolved Packet Core (EPC) 160, and another core network 190 (e.g., a 5G core (5 GC)). Base station 102 may include macro cells (high power cell base stations) and/or small cells (low power cell base stations). The macrocell includes a base station. Small cells include femtocells, picocells, and microcells.

A base station 102 configured for 4G LTE, collectively referred to as an evolved Universal Mobile Telecommunications System (UMTS) terrestrial radio access network (E-UTRAN), may interface with the EPC 160 through a first backhaul link 132 (e.g., an S1 interface). A base station 102 configured for 5G NR, collectively referred to as a next generation RAN (NG-RAN), may interface with a core network 190 over a second backhaul link 184. Among other functions, the base station 102 may perform one or more of the following functions: user data delivery, radio channel ciphering and ciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection setup and release, load balancing, distribution of non-access stratum (NAS) messages, NAS node selection, synchronization, radio Access Network (RAN) sharing, multimedia Broadcast Multicast Services (MBMS), subscriber and equipment tracking, RAN Information Management (RIM), paging, positioning, and delivery of alert messages. The base stations 102 may communicate with each other directly or indirectly (e.g., through the EPC 160 or the core network 190) over a third backhaul link 134 (e.g., an X2 interface). The first backhaul link 132, the second backhaul link 184, and the third backhaul link 134 may be wired or wireless.

In some aspects, the base station 102 or 180 may be referred to as a RAN and may include aggregated or decomposed components. As an example of a split RAN, a base station may include a Central Unit (CU) 106, one or more Distributed Units (DUs) 105, and/or one or more Remote Units (RUs) 109, as illustrated in fig. 1. The RAN may be broken up with a split between RU 109 and the aggregated CUs/DUs. The RAN may be broken up with a split between CU 106, DU 105 and RU 109. The RAN may be broken up with a split between CU 106 and aggregated DUs/RUs. CU 106 and one or more DUs 105 may be connected via an F1 interface. The DU 105 and RU 109 may be connected via an outbound interface. The connection between CU 106 and DU 105 may be referred to as mid-range, while the connection between DU 105 and RU 109 may be referred to as out-range. The connection between the CU 106 and the core network may be referred to as backhaul. The RAN may be based on a functional partitioning between various components of the RAN (e.g., between CUs 106, DUs 105, or RUs 109). A CU may be configured to perform one or more aspects of the wireless communication protocol (e.g., to handle one or more layers of the protocol stack), and DU(s) may be configured to handle other aspects of the wireless communication protocol (e.g., other layers of the protocol stack). In different implementations, the splitting between the layers handled by the CU and the layers handled by the DU may occur at different layers of the protocol stack. As one non-limiting example, the DU 105 may provide a logical node to host at least a portion of a Radio Link Control (RLC), medium Access Control (MAC), and Physical (PHY) layers based on a functional split. An RU may provide a logical node configured to host at least a portion of a PHY layer and Radio Frequency (RF) processing. CU 106 may host higher layer functions, e.g., above the RLC layer, such as a Service Data Adaptation Protocol (SDAP) layer, a Packet Data Convergence Protocol (PDCP) layer. In other implementations, the split between layer functions provided by a CU, DU, or RU may be different.

The access network may include one or more Integrated Access and Backhaul (IAB) nodes 111 that exchange wireless communications with UEs 104 or other IAB nodes 111 to provide access and backhaul to the core network. In an IAB network of multiple IAB nodes, the anchor node may be referred to as an IAB donor. The IAB donor may be a base station 102 or 180 that provides access to the core network 190 or EPC 160 and/or control of one or more IAB nodes 111. The IAB donor may include CU 106 and DU 105. The IAB node 111 may include a DU 105 and a Mobile Terminal (MT). The DU 105 of the IAB node 111 may operate as a parent node and the MT may operate as a child node.

The base station 102 may be in wireless communication with the UE 104. Each base station 102 may provide communication coverage for a respective geographic coverage area 110. There may be overlapping geographic coverage areas 110. For example, the small cell 102 'may have a coverage area 110' that overlaps with the coverage area 110 of one or more macro base stations 102. A network comprising both small cells and macro cells may be referred to as a heterogeneous network. The heterogeneous network may also include a home evolved node B (eNB) (HeNB) that may provide services to a restricted group known as a Closed Subscriber Group (CSG). The communication link 120 between the base station 102 and the UE 104 may include Uplink (UL) (also referred to as reverse link) transmissions from the UE 104 to the base station 102 and/or Downlink (DL) (also referred to as forward link) transmissions from the base station 102 to the UE 104. Communication link 120 may use multiple-input multiple-output (MIMO) antenna techniques including spatial multiplexing, beamforming, and/or transmit diversity. These communication links may be through one or more carriers. For each carrier allocated in carrier aggregation up to yxmhz (x component carriers) in total for transmission in each direction, the base station 102/UE 104 may use a spectrum up to Y MHz (e.g., 5, 10, 15, 20, 100, 400MHz, etc.) bandwidth. These carriers may or may not be contiguous with each other. The allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated to DL than UL). The component carriers may include a primary component carrier and one or more secondary component carriers. The primary component carrier may be referred to as a primary cell (PCell) and the secondary component carrier may be referred to as a secondary cell (SCell).

Some UEs 104 may communicate with each other using a device-to-device (D2D) communication link 158. The D2D communication link 158 may use the DL/UL WWAN spectrum. The D2D communication link 158 may use one or more side link channels such as a physical side link broadcast channel (PSBCH), a physical side link discovery channel (PSDCH), a physical side link shared channel (PSSCH), and a physical side link control channel (PSCCH). D2D communication may be through a variety of wireless D2D communication systems such as, for example, wiMedia, bluetooth, zigBee, wi-Fi based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, LTE, or NR.

The wireless communication system may further include a Wi-Fi Access Point (AP) 150 in communication with a Wi-Fi Station (STA) 152 via a communication link 154, such as in a 5GHz unlicensed spectrum or the like. When communicating in the unlicensed spectrum, the STA 152/AP 150 may perform a Clear Channel Assessment (CCA) prior to communication to determine whether the channel is available.

The small cell 102' may operate in licensed and/or unlicensed spectrum. When operating in unlicensed spectrum, the small cell 102' may employ NR and use the same unlicensed spectrum (e.g., 5GHz, etc.) as used by the Wi-Fi AP 150. Small cells 102' employing NR in the unlicensed spectrum may push up access network coverage and/or increase access network capacity.

The electromagnetic spectrum is typically subdivided into various categories, bands, channels, etc., based on frequency/wavelength. In 5G NR, two initial operating bands have been identified as frequency range designated FR1 (410 MHz-7.125 GHz) and FR2 (24.25 GHz-52.6 GHz). Although a portion of FR1 is greater than 6GHz, FR1 is often (interchangeably) referred to as the "sub-6 GHz" band in various documents and articles. Similar naming problems sometimes occur with respect to FR2, which is commonly (interchangeably) referred to as the "millimeter wave" band in various documents and articles, although it is different from the Extremely High Frequency (EHF) band (30 GHz-300 GHz) identified by the International Telecommunications Union (ITU) as the "millimeter wave" band.

The frequency between FR1 and FR2 is commonly referred to as the mid-band frequency. Recent 5G NR studies have identified the operating band of these mid-band frequencies as frequency range designation FR3 (7.125 GHz-24.25 GHz). The frequency bands falling within FR3 may inherit FR1 characteristics and/or FR2 characteristics and thus may effectively extend the characteristics of FR1 and/or FR2 into mid-band frequencies. Additionally, higher frequency bands are currently being explored to extend 5G NR operation above 52.6 GHz. For example, three higher operating bands have been identified as frequency range designation FR2-2 (52.6 GHz-71 GHz), FR4 (71 GHz-114.25 GHz) and FR5 (114.25 GHz-300 GHz). Each of these higher frequency bands falls within the EHF frequency band.

In view of the above, unless specifically stated otherwise, it is to be understood that, if used herein, the term "sub-6 GHz" or the like may broadly represent frequencies that may be less than 6GHz, may be within FR1, or may include mid-band frequencies. Furthermore, unless specifically stated otherwise, it should be understood that, if used herein, the term "millimeter wave" or the like may broadly mean frequencies that may include mid-band frequencies, may be within FR2, FR4, FR2-2 and/or FR5, or may be within the EHF band.

Whether small cell 102' or a large cell (e.g., macro base station), base station 102 may include and/or be referred to as an eNB, g B node (gNB), or another type of base station. Some base stations (such as the gNB 180) may operate in the traditional sub-6 GHz spectrum, in millimeter wave frequencies, and/or near millimeter wave frequencies to communicate with the UE 104. When gNB 180 operates in millimeter wave frequencies or near millimeter wave frequencies, gNB 180 may be referred to as a millimeter wave base station. Millimeter-wave base station 180 may utilize beamforming 182 with UE 104 to compensate for path loss and short range. The base station 180 and the UE 104 may each include multiple antennas, such as antenna elements, antenna panels, and/or antenna arrays, to facilitate beamforming.

The base station 180 may transmit the beamformed signals to the UE 104 in one or more transmit directions 182'. The UE 104 may receive the beamformed signals from the base station 180 in one or more receive directions 182 ". The UE 104 may also transmit the beamformed signals in one or more transmit directions to the base station 180. The base station 180 may receive the beamformed signals from the UEs 104 in one or more receive directions. The base stations 180/UEs 104 may perform beam training to determine the best receive direction and transmit direction for each of the base stations 180/UEs 104. The transmit direction and the receive direction of the base station 180 may be the same or may be different. The transmit direction and the receive direction of the UE 104 may be the same or may be different.

EPC 160 may include a Mobility Management Entity (MME) 162, other MMEs 164, a serving gateway 166, a Multimedia Broadcast Multicast Service (MBMS) gateway 168, a broadcast multicast service center (BM-SC) 170, and a Packet Data Network (PDN) gateway 172.MME 162 may be in communication with a Home Subscriber Server (HSS) 174. The MME 162 is a control node that handles signaling between the UE 104 and the EPC 160. Generally, MME 162 provides bearer and connection management. All user Internet Protocol (IP) packets are communicated through the serving gateway 166, which serving gateway 166 itself is connected to the PDN gateway 172. The PDN gateway 172 provides UE IP address allocation as well as other functions. The PDN gateway 172 and BM-SC 170 are connected to an IP service 176.IP services 176 may include the internet, intranets, IP Multimedia Subsystem (IMS), PS streaming services, and/or other IP services. The BM-SC 170 may provide functionality for MBMS user service provisioning and delivery. The BM-SC 170 may be used as an entry point for content provider MBMS transmissions, may be used to authorize and initiate MBMS bearer services within a Public Land Mobile Network (PLMN), and may be used to schedule MBMS transmissions. The MBMS gateway 168 may be used to distribute MBMS traffic to base stations 102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area broadcasting a particular service and may be responsible for session management (start/stop) and for collecting eMBMS related charging information.

The core network 190 may include access and mobility management functions (AMFs) 192, other AMFs 193, session Management Functions (SMFs) 194, and User Plane Functions (UPFs) 195. The AMF 192 may be in communication with a Unified Data Management (UDM) 196. The AMF 192 is a control node that handles signaling between the UE 104 and the core network 190. In general, AMF 192 provides QoS flows and session management. All user Internet Protocol (IP) packets are delivered through UPF 195. The UPF 195 provides UE IP address assignment as well as other functions. The UPF 195 is connected to an IP service 197.IP services 197 may include the internet, intranets, IP Multimedia Subsystem (IMS), packet Switched (PS) streaming (PSs) services, and/or other IP services.

A base station may include and/or be referred to as a gNB, a node B, an eNB, an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a Basic Service Set (BSS), an Extended Service Set (ESS), a transmission-reception point (TRP), or some other suitable terminology. The base station 102 provides an access point for the UE 104 to the EPC 160 or core network 190. Examples of UEs 104 include a cellular telephone, a smart phone, a Session Initiation Protocol (SIP) phone, a laptop, a Personal Digital Assistant (PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player), a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electricity meter, an air pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor/actuator, a display, or any other similar functional device. Some UEs 104 may be referred to as IoT devices (e.g., parking timers, oil pumps, ovens, vehicles, heart monitors, etc.). The UE 104 may also be referred to as a station, mobile station, subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, or some other suitable terminology. In some scenarios, the term UE may also apply to one or more companion devices, such as in a device constellation arrangement. One or more of these devices may access the network in common and/or individually.

Referring again to fig. 1, in some aspects, the UE 104 may include a PDCCH cross-carrier scheduling component 198, the PDCCH cross-carrier scheduling component 198 configured to receive from a base station a configuration for one or more CSSs configured on a first cell and one or more PDCCH candidates configured on a second cell, the configuration for a jet including scheduling data for the first cell, the first cell including at least one of a PCell or a PSCell and the second cell including a SCell; and performing blind decoding of the one or more PDCCH candidates based on the configuration and in at least one of the one or more CSSs or the one or more USSs on the first cell and the one or more USSs on the second cell within a scheduled cell limit comprising a first BD total number and a second non-overlapping CCE total number for the PDCCH candidates. In certain aspects, base station 180 may include PDCCH cross-carrier scheduling component 199, PDCCH cross-carrier scheduling component 199 configured to configure a first threshold indicating a first maximum number of BDs for PDCCH candidates on a first cell and a second threshold indicating a second maximum number of non-overlapping CCEs for these PDCCH candidates; transmitting to the UE a configuration for one or more CSSs configured on a first cell and one or more PDCCH candidates in one or more USSs configured on a second cell, the configuration for a PDCCH comprising scheduling data for the first cell, the first cell comprising at least one of a PCell or a PSCell, and the second cell comprising an SCell; and based on the configuration and within a scheduled cell limit comprising a first BD total number and a second non-overlapping CCE total number for PDCCH candidates, transmitting at least one PDCCH to the UE for a PDCCH comprising a schedule for the first cell in one or more PDCCH candidates configured on the first cell and one or more USSs on the second cell. Although the following description may focus on 5G NR, the concepts described herein may be applicable to other similar fields, such as LTE, LTE-A, CDMA, GSM, and other wireless technologies.

Fig. 2A is a diagram 200 illustrating an example of a first subframe within a 5G NR frame structure. Fig. 2B is a diagram 230 illustrating an example of DL channels within a 5G NR subframe. Fig. 2C is a diagram 250 illustrating an example of a second subframe within a 5G NR frame structure. Fig. 2D is a diagram 280 illustrating an example of UL channels within a 5G NR subframe. The 5G NR frame structure may be Frequency Division Duplex (FDD), where for a particular set of subcarriers (carrier system bandwidth), the subframes within that set of subcarriers are dedicated to DL or UL; or may be Time Division Duplex (TDD) in which for a particular set of subcarriers (carrier system bandwidth), the subframes within that set of subcarriers are dedicated to both DL and UL. In the example provided by fig. 2A, 2C, the 5G/NR frame structure is assumed to be TDD, with subframe 4 configured with slot format 28 (mostly DL), where D is DL, U is UL, and F is for flexible use between DL/UL, and subframe 3 configured with slot format 1 (all UL). Although subframes 3, 4 are shown as having slot formats 1, 28, respectively, any particular subframe may be configured with any of the various available slot formats 0-61. The slot formats 0, 1 are full DL, full UL, respectively. Other slot formats 2-61 include a mix of DL, UL, and flexible symbols. The UE is configured with a slot format (dynamically configured by DL Control Information (DCI) or semi-statically/statically configured by Radio Resource Control (RRC) signaling) through a received Slot Format Indicator (SFI). Note that the following description also applies to a 5G NR frame structure that is TDD.

Fig. 2A-2D illustrate frame structures, and aspects of the present disclosure may be applicable to other wireless communication technologies that may have different frame structures and/or different channels. A frame (10 ms) may be divided into 10 equally sized subframes (1 ms). Each subframe may include one or more slots. The subframe may also include a mini slot, which may include 7, 4, or 2 symbols. Each slot may include 14 or 12 symbols depending on whether the Cyclic Prefix (CP) is normal or extended. For normal CP, each slot may include 14 symbols, and for extended CP, each slot may include 12 symbols. The symbols on the DL may be CP Orthogonal Frequency Division Multiplexing (OFDM) (CP-OFDM) symbols. The symbols on the UL may be CP-OFDM symbols (for high throughput scenarios) or Discrete Fourier Transform (DFT) -spread OFDM (DFT-s-OFDM) symbols (also known as single carrier frequency division multiple access (SC-FDMA) symbols) (for power limited scenarios; limited to single stream transmission). The number of slots within a subframe is designed based on the CP and parameters. The parameter design defines the subcarrier spacing (SCS) and in practice defines the symbol length/duration, which is equal to 1/SCS.

For normal CP (14 symbols/slot), different parameter designs μ0 to 4 allow 1, 2, 4, 8 and 16 slots per subframe, respectively. For extended CP, parameter design 2 allows 4 slots per subframe. Accordingly, for normal CP and parameter design μ, there are 14 symbols/slot and 2 ^μ Each slot/subframe. The subcarrier spacing may be equal to 2 ^μ *15kHz, where μ is the parameter design 0 to 4. Thus, parameter design μ=0 has a subcarrier spacing of 15kHz, while parameter design μ=4 has a subcarrier spacing of 240 kHz. The symbol length/duration is inversely related to the subcarrier spacing. Fig. 2A-2D provide examples of a normal CP with a parameter design μ=2 of 14 symbols per slot and 4 slots per subframe. The slot duration is 0.25ms, the subcarrier spacing is 60kHz, and the symbol duration is approximately 16.67 mus. Within a frame set there may be one or more different frequency division multiplexedBandwidth part (BWP) (see fig. 2B). Each BWP may have a specific parameter design and CP (normal or extended).

The resource grid may be used to represent a frame structure. Each slot includes Resource Blocks (RBs) (also referred to as Physical RBs (PRBs)) that extend for 12 consecutive subcarriers. The resource grid is divided into a plurality of Resource Elements (REs). The number of bits carried by each RE depends on the modulation scheme.

As illustrated in fig. 2A, some REs carry a reference (pilot) signal (RS) for the UE. The RSs may include demodulation RSs (DM-RSs) for channel estimation at the UE (indicated as R for one particular configuration, but other DM-RS configurations are possible) and channel state information reference signals (CSI-RSs). The RSs may also include beam measurement RSs (BRSs), beam Refinement RSs (BRRSs), and phase tracking RSs (PT-RSs).

Fig. 2B illustrates an example of various DL channels within a subframe of a frame. A Physical Downlink Control Channel (PDCCH) carries DCI within one or more Control Channel Elements (CCEs) (e.g., 1, 2, 4, 8, or 16 CCEs), each CCE including 6 RE groups (REGs), each REG including 12 consecutive REs in an OFDM symbol of an RB. The PDCCH within one BWP may be referred to as a control resource set (CORESET). The UE is configured to monitor PDCCH candidates in a PDCCH search space (e.g., a common search space, a UE-specific search space) during a PDCCH monitoring occasion on CORESET, wherein the PDCCH candidates have different DCI formats and different aggregation levels. Additional BWP may be located at higher and/or lower frequencies across the channel bandwidth. The Primary Synchronization Signal (PSS) may be within symbol 2 of a particular subframe of a frame. The PSS is used by the UE 104 to determine subframe/symbol timing and physical layer identity. The Secondary Synchronization Signal (SSS) may be within symbol 4 of a particular subframe of a frame. SSS is used by the UE to determine the physical layer cell identity group number and radio frame timing. Based on the physical layer identity and the physical layer cell identity group number, the UE may determine a Physical Cell Identifier (PCI). Based on the PCI, the UE may determine the location of the DM-RS. A Physical Broadcast Channel (PBCH) carrying a Master Information Block (MIB) may be logically grouped with PSS and SSS to form a Synchronization Signal (SS)/PBCH block (also referred to as an SS block (SSB)). The MIB provides the number of RBs in the system bandwidth, and a System Frame Number (SFN). The Physical Downlink Shared Channel (PDSCH) carries user data, broadcast system information such as System Information Blocks (SIBs) not transmitted over the PBCH, and paging messages.

As illustrated in fig. 2C, some REs carry DM-RS for channel estimation at the base station (indicated as R for one particular configuration, but other DM-RS configurations are possible). The UE may transmit DM-RS for a Physical Uplink Control Channel (PUCCH) and DM-RS for a Physical Uplink Shared Channel (PUSCH). The PUSCH DM-RS may be transmitted in the previous or the previous two symbols of the PUSCH. The PUCCH DM-RS may be transmitted in different configurations depending on whether the short PUCCH or the long PUCCH is transmitted and depending on the specific PUCCH format used. The UE may transmit Sounding Reference Signals (SRS). The SRS may be transmitted in the last symbol of the subframe. The SRS may have a comb structure, and the UE may transmit the SRS on one of the comb. The SRS may be used by the base station for channel quality estimation to enable frequency-dependent scheduling on the UL.

Fig. 2D illustrates an example of various UL channels within a subframe of a frame. The PUCCH may be located as indicated in one configuration. The PUCCH carries Uplink Control Information (UCI) such as a scheduling request, a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a Rank Indicator (RI), and hybrid automatic repeat request (HARQ) Acknowledgement (ACK) (HARQ-ACK) feedback (i.e., one or more HARQ ACK bits indicating one or more ACKs and/or Negative ACKs (NACKs)). PUSCH carries data and may additionally be used to carry Buffer Status Reports (BSR), power Headroom Reports (PHR), and/or UCI.

Fig. 3 is a block diagram of a base station 310 in communication with a UE 350 in an access network. In DL, IP packets from EPC 160 may be provided to controller/processor 375. Controller/processor 375 implements layer 3 and layer 2 functionality. Layer 3 includes a Radio Resource Control (RRC) layer, and layer 2 includes a Service Data Adaptation Protocol (SDAP) layer, a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, and a Medium Access Control (MAC) layer. Controller/processor 375 provides RRC layer functionality associated with the broadcast of system information (e.g., MIB, SIB), RRC connection control (e.g., RRC connection paging, RRC connection setup, RRC connection modification, and RRC connection release), inter-Radio Access Technology (RAT) mobility, and measurement configuration of UE measurement reports; PDCP layer functionality associated with header compression/decompression, security (ciphering, integrity protection, integrity verification), and handover support functions; RLC layer functionality associated with delivery of upper layer Packet Data Units (PDUs), error correction by ARQ, concatenation of RLC Service Data Units (SDUs), segmentation and reassembly, re-segmentation of RLC data PDUs, and re-ordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing MAC SDUs onto Transport Blocks (TBs), de-multiplexing MAC SDUs from TBs, scheduling information reporting, error correction by HARQ, priority handling, and logical channel priority differentiation.

Transmit (TX) processor 316 and Receive (RX) processor 370 implement layer 1 functionality associated with a variety of signal processing functions. Layer 1, which includes a Physical (PHY) layer, may include error detection on a transport channel, forward Error Correction (FEC) decoding/decoding of a transport channel, interleaving, rate matching, mapping onto a physical channel, modulation/demodulation of a physical channel, and MIMO antenna processing. TX processor 316 handles the mapping to signal constellations based on various modulation schemes, such as binary phase-shift keying (BPSK), quadrature phase-shift keying (QPSK), M-phase-shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM). The coded and modulated symbols may then be split into parallel streams. Each stream may then be mapped to OFDM subcarriers, multiplexed with reference signals (e.g., pilots) in the time and/or frequency domain, and then combined together using an Inverse Fast Fourier Transform (IFFT) to produce a physical channel carrying the time domain OFDM symbol stream. The OFDM streams are spatially precoded to produce a plurality of spatial streams. The channel estimates from the channel estimator 374 may be used to determine the coding and modulation scheme and for spatial processing. The channel estimate may be derived from reference signals and/or channel condition feedback transmitted by the UE 350. Each spatial stream may then be provided to a different antenna 320 via a separate transmitter 318 TX. Each transmitter 318TX may modulate a Radio Frequency (RF) carrier with a respective spatial stream for transmission.

At the UE 350, each receiver 354RX receives the signal via its respective antenna 352. Each receiver 354RX recovers information modulated onto an RF carrier and provides the information to the Receive (RX) processor 356.TX processor 368 and RX processor 356 implement layer 1 functionality associated with various signal processing functions. RX processor 356 can perform spatial processing on the information to recover any spatial streams destined for UE 350. If there are multiple spatial streams destined for the UE 350, they may be combined into a single OFDM symbol stream by the RX processor 356. RX processor 356 then converts the OFDM symbol stream from the time domain to the frequency domain using a Fast Fourier Transform (FFT). The frequency domain signal comprises a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols on each subcarrier, as well as the reference signal, are recovered and demodulated by determining the signal constellation points most likely to be transmitted by the base station 310. These soft decisions may be based on channel estimates computed by channel estimator 358. These soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by the base station 310 on the physical channel. These data and control signals are then provided to a controller/processor 359 that implements layer 3 and layer 2 functionality.

A controller/processor 359 can be associated with the memory 360 that stores program codes and data. Memory 360 may be referred to as a computer-readable medium. In the UL, the controller/processor 359 provides demultiplexing between transport and logical channels, packet reassembly, cipher interpretation, header decompression, and control signal processing to recover IP packets from the EPC 160. The controller/processor 359 is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations.

Similar to the functionality described in connection with DL transmissions by the base station 310, the controller/processor 359 provides RRC layer functionality associated with system information (e.g., MIB, SIB) acquisition, RRC connection, and measurement reporting; PDCP layer functionality associated with header compression/decompression, and security (ciphering, integrity protection, integrity verification); RLC layer functionality associated with upper layer PDU delivery, error correction by ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and re-ordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing MAC SDUs onto TBs, de-multiplexing MAC SDUs from TBs, scheduling information reporting, error correction by HARQ, priority handling, and logical channel priority differentiation.

Channel estimates, derived by channel estimator 358 from reference signals or feedback transmitted by base station 310, may be used by TX processor 368 to select appropriate coding and modulation schemes, as well as to facilitate spatial processing. The spatial streams generated by TX processor 368 may be provided to different antenna 352 via separate transmitters 354 TX. Each transmitter 354TX may modulate an RF carrier with a respective spatial stream for transmission.

UL transmissions are processed at the base station 310 in a manner similar to that described in connection with the receiver functionality at the UE 350. Each receiver 318RX receives a signal through its corresponding antenna 320. Each receiver 318RX recovers information modulated onto an RF carrier and provides the information to the RX processor 370.

The controller/processor 375 may be associated with a memory 376 that stores program codes and data. Memory 376 may be referred to as a computer-readable medium. In the UL, the controller/processor 375 provides demultiplexing between transport and logical channels, packet reassembly, cipher interpretation, header decompression, control signal processing to recover IP packets from the UE 350. IP packets from controller/processor 375 may be provided to EPC 160. Controller/processor 375 is also responsible for error detection using ACK and/or NACK protocols to support HARQ operations.

At least one of TX processor 368, RX processor 356, and controller/processor 359 may be configured to perform aspects in conjunction with 198 of fig. 1. At least one of TX processor 316, RX processor 370, and controller/processor 375 may be configured to perform the various aspects recited in connection with 199 of fig. 1.

The UE may receive a PDCCH from a network (including a base station) carrying DCI that schedules uplink and/or downlink transmissions for the UE. For example, the PDCCH may schedule PUSCH transmissions from a UE, PDSCH transmissions to the UE, and so on. Since the UE may be located at the cell edge, the PDCCH may be transmitted by the base station with higher transmit power than the traffic channel. PDCCH transmissions with higher transmit power may cause interference, including inter-cell interference on the PDCCH. If the network and the UE support Carrier Aggregation (CA), the network and the UE may implement cross-carrier scheduling for UEs connected to the PCell and the SCell. The UE may receive the PDCCH on a different carrier than the PUSCH/PDSCH scheduled by the PDCCH. Accordingly, the network and the UE may reduce inter-cell interference from transmitting the PDCCH with increased transmit power by transmitting the PDCCH to the UE via different carriers.

The network and the UE may support dual connectivity, and the UE may be connected to the primary node and the secondary node to communicate with the network. The primary node may provide a control plane connection to the network and the secondary node may provide additional resources without a control plane connection to the network. The UE may connect to a Master Cell Group (MCG) that includes a serving cell group associated with the master node, and the MCG may include a PCell and one or more scells. The UE may connect to a Secondary Cell Group (SCG) that includes a serving cell group associated with the secondary node, and the SCG may include a primary secondary cell (PSCell) and one or more scells.

In an aspect, PDSCH or PUSCH on SCell may be cross-carrier scheduled from PDCCH on PCell or PSCell (PCell/PSCell). That is, the UE may receive a PDCCH on the PCell/PSCell scheduling PDSCH or PUSCH on the SCell. PDSCH or PUSCH on PCell/PSCell may be cross-carrier scheduled from PDCCH on SCell. That is, the UE may receive a PDCCH on the SCell that schedules the PDSCH or PUSCH on the PCell/PSCell. In an aspect, a UE may be connected to one PCell and one or more scells, and a network may configure one of the one or more scells as an SCell to carry a PDCCH for cross-carrier scheduling to the PCell. In another aspect, a UE with DC may be connected to one PSCell and one or more scells on an SCG, and the network may configure one of the one or more scells as an SCell to carry a PDCCH for cross-carrier scheduling to the PSCell.

When cross-carrier scheduling from SCell to PCell/PSCell is configured, the UE may be configured to monitor PDCCH candidates on SCell for PDCCHs including DCI formats 0_1, 1_1, 0_2, or 1_2, which may schedule at least one of PDSCH or PUSCH on PCell/PSCell. The UE may monitor one or more Common Search Spaces (CSSs) or one or more user specific search spaces (USSs) on the PCell/PSCell or PDCCH candidates in one or more USSs on the SCell to receive the PDCCH. The one or more CSSs may be referred to as one or more CSS sets and the one or more USSs may be referred to as one or more USS sets. The UE may monitor one or more CSS sets on PCell/PSCell for DCI formats 0_0 and 1_0 'that' schedule PDSCH/PUSCH on PCell/PSCell.

In an aspect, a UE may support monitoring PDCCH candidates in one or more USS sets on an SCell to receive PDCCH scheduling PDSCH or PUSCH on a PCell/PSCell. In another aspect, the UE may support monitoring PDCCH candidates in one or more USS sets on the SCell and/or in one or more USS sets on the PCell/PSCell.

Fig. 4 is an example configuration 400 of cross-carrier scheduling for a wireless communication method. The example configuration 400 may include a PCell/PSCell 410 and an SCell 450. According to example configuration 400, the ue may support PDCCH candidates in one or more USS sets on the SCell to receive PDCCH scheduling PDSCH or PUSCH on the PCell/PSCell.

The base station may transmit a PDCCH scheduling a PDSCH or PUSCH on PCell/PSCell (PCell/PSCell PDSCH/PUSCH 416) to the UE in one or more CSSs on PCell/PSCell (PCell/PSCell CSS 412) and in a PDCCH candidate in one or more USSs on SCell (first SCell USS 452). The base station may also transmit a PDCCH scheduling PDSCH or PUSCH on SCell (SCell PDSCH/PUSCH 456) to the UE in PDCCH candidates in one or more USSs on SCell (second SCell USS 454).

The UE may receive a configuration for monitoring one or more PDCCH candidates in one or more PCell/PSCell CSSs 412 and one or more first SCell USSs 452 for PDCCH in order to receive scheduling data for PCell/PSCell. The UE may monitor PDCCH candidates based on the configuration for the one or more PCell/PSCell CSSs 412 and the one or more first SCell USSs 452. Monitoring may include attempting to perform blind decoding of PDCCH candidates in order to receive PDCCH scheduling PCell/PSCell PDSCH/PUSCH 416.

The one or more PCell/PSCell CSSs 412 and the one or more first SCell USSs 452 may not support oversubscription PDCCH candidates. That is, the UE may support PDCCH candidates in one or more USS on the SCell up to a threshold limit. The UE may not be configured with PDCCH oversubscription that triggers the UE to check whether there are more than a threshold number of blind decodes or to monitor more than a threshold number of non-overlapping Control Channel Elements (CCEs). Accordingly, the network including the base station may search the set of spaces (e.g., CSS and USS) for UEs such that the number of Blind Decodes (BD) and non-overlapping CCEs used to schedule PDCCH candidates for PDSCH/PUSCH on PCell/PSCell during a time slot or other period of time that may be referred to as a PDCCH monitoring span does not exceed a particular value. That is, the network may configure or identify a first threshold indicating a first maximum BD number of PDSCH/PUSCH for scheduling PCell/PSCell of the UE and a second threshold indicating a second maximum non-overlapping CCE number. The base station may then configure the one or more PCell/PSCell CSSs 412 not to exceed the first and second thresholds for scheduling PDSCH/PUSCH on the PCell/PSCell.

In some aspects, the scheduled cell restriction may indicate a first BD total and a second non-overlapping CCE total for the PDCCH candidate. Based on the scheduled cell restriction and the first and second thresholds, the base station may configure a third maximum BD number and a fourth maximum non-overlapping CCE number of PDCCH candidates in SCell USS 452 for scheduling PDSCH/PUSCH on PCell/PSCell. In some aspects, the third maximum BD number of PDCCH candidates for SCell USS 452 scheduling PDSCH/PUSCH on PCell/PSCell may be based on the scheduled cell restriction of BD minus a first threshold, and the fourth maximum non-overlapping CCE number of PDCCH candidates scheduling PDSCH/PUSCH on the PCell/PSCell of SCell USS 452 may be based on the scheduled cell restriction of non-overlapping CCEs minus a second threshold.

Fig. 5 is an example 500 of cross-slot BD for cross-carrier scheduling of UEs including threshold levels of BD/non-overlapping CCEs. Example 500 may indicate BD 520 for USS set on SCell for scheduling PDSCH/PUSCH on PCell/PSCell and BD 540 for CSS set on PCell/PSCell. The example 500 of BD may be associated with a UE that may support receiving PDCCH in PDCCH candidates of one or more USS sets on SCell that schedule PDSCH or PUSCH on PCell/PSCell. Here, example 500 indicates BD, but the present disclosure is not limited thereto, and example 500 may indicate a threshold of non-overlapping CCEs within a slot. Further, example 500 indicates that BD is provided on a slot basis, but the present disclosure is not limited thereto, and example 500 may be provided according to per PDCCH monitoring span having a different size from slot.

In some aspects, the network may reserve a minimum number of PDCCH candidates for the CSS set on PCell/PSCell (i.e., one or more PCell/PSCell CSSs 412). The maximum available number of BD and non-overlapping CCEs for PDCCH candidates of a set of USSs (i.e., one or more first SCell USSs 452) scheduling PDSCH/PUSCH on PCell/PSCell on SCell may be determined based on the reserved number. In some aspects, the base station may configure a first maximum BD number of PDCCH candidates for the CSS set of PCell/PSCell and/or may configure a second maximum non-overlapping CCE number of PDCCH candidates for the CSS set of PCell/PSCell. In some aspects, the network may configure a third maximum BD number and/or a fourth maximum non-overlapping CCE number for USSs on the SCell based on the first and second thresholds. For example, the third maximum BD number for USS on the SCell may be based on the scheduled cell limit of BD minus a first threshold, and the fourth maximum non-overlapping CCE number for USS on the SCell may be based on the scheduled cell limit of non-overlapping CCEs minus a second threshold. The scheduled cell restriction may indicate a first BD total and a second non-overlapping CCE total for PDCCH candidates.

Referring to example 500, a first threshold 510 indicating a maximum BD number for CSS on the PCell/PSCell may be determined based on the time slot having the highest BD number among all time slots. That is, example 500 provides that slot 2 has the highest BD number among the ten slots from slot 0 to slot 9, and this may be the first threshold 510 as BD number 542 on PCell/PSCell.

Thus, the number of BDs available for PDCCH candidates on the SCell may be determined as the maximum number of BDs limited by the scheduled cell minus a first threshold indicating the maximum number of BDs on the PCell/PSCell across all slots. In example 500, the maximum BD number on PCell/PSCell across slots is BD number 542 on PCell/PSCell on slot number 2. The network may configure one or more USSs on the SCell such that PDCCH oversubscription is not provided.

The total number of BD and non-overlapping CCEs allocated for PDCCH candidates for scheduling PCell/PSCell cannot exceed the per-cell limit (or the scheduled cell limit). That is, the total number of BDs and non-overlapping CCEs allocated for PDCCH candidates on the PCell/PSCell and SCell for each slot may not exceed the scheduled cell limit. For example, this may be expressed as the number of BD on +PCell/PSCell for BD and the number of CCEs +SCell for CCE for +PCell/PSCell for BD. For example, in fig. 5, the scheduled cell restriction for BD of PCell/PSCell = BD number on PCell/PSCell at slot # 2. Scheduled cell restriction for CCEs for PCell/PSCell = CCE number on PCell/PSCell at slot # 2. The scheduled cell limit for BD of SCell is ≡on the scheduled cell limit for BD-the scheduled cell limit for BD of PCell/PScell. The scheduled cell restriction for CCEs of SCell is ≡the scheduled cell restriction for CCEs-the scheduled cell restriction for CCEs of PCell/PSCell. The scheduled cell restriction may indicate a first maximum number of BDs for the PDCCH candidate and a second maximum number of non-overlapping CCEs for the PDCCH candidate, and the total number of BDs allocated for the PDCCH candidate may not exceed the first maximum number of BDs for the PDCCH candidate, and the total number of non-overlapping CCEs allocated for the PDCCH candidate may not exceed the second maximum number of non-overlapping CCEs for the PDCCH candidate.

In one aspect, different subcarrier spacing (SCS) may be used for PDCCH candidates on the PCell/PSCell and on the SCell, and the network may use the lower SCS between the two SCSs as a reference SCS for determining the scheduled cell limitations. That is, the PCell/PSCell may have a first SCS and the SCell may have a second SCS, and when the first SCS is greater than the second SCS, the network may use the second SCS of the SCell to determine the scheduled cell restriction. When the second SCS of the SCell is greater than the first SCS of the PCell/PSCell, the network may use the first SCS of the PCell/PSCell to determine the scheduled cell restriction. In another aspect, the same SCS may be used for PDCCH candidates on the PCell/PSCell and on the SCell, and the network may use the same SCS associated with the PCell/PSCell and the SCell to determine the scheduled cell restriction.

In another aspect, the UE may report PDCCH blind decoding capability for CA supported by the UE to the network. For example, the UE may signal a parameter (e.g., PDCCH-blinddetection CA (PDCCH-blind detection CA)) to the base station indicating PDCCH blind decoding capability for CA supported by the UE. In some aspects, the UE may provide an indication in UE capability signaling in an RRC message. The network including the base station may determine the scheduled cell restriction based on the smaller of the single cell restriction and the CA restriction. The CA limit may be derived based on the number of DL cells for CA, reported UE capabilities (e.g., pdcch-blind detect CA), and reference SCS (e.g., 15 kHz).

In one aspect, the maximum number of BD and non-overlapping CCEs used to schedule PDCCH candidates for PCell/PSCell may be determined as the value on the time slot where these values are highest within a time frame (such as a group of time slots). In some aspects, the network may configure the first threshold 510 as a first maximum BD number 542 on PCell/PSCell. In the case where example 500 indicates non-overlapping CCEs for scheduling PDCCH candidates for PCell/PSCell, the network may configure the first threshold 510 to be the number of non-overlapping CCEs 542 on PCell/PSCell.

The maximum number of BD and non-overlapping CCEs monitored on the SCell for PDCCH candidates for scheduling PCell/PSCell may be determined by subtracting a first threshold indicative of a first maximum number of BD candidates for scheduling PCell/PSCell and a second threshold indicative of a second maximum number of non-overlapping CCEs from the scheduled cell limit.

Fig. 6 is an example configuration 600 for cross-carrier scheduling for a wireless communication method. Example configuration 600 may include a PCell or PSCell 610 and an SCell 650. According to example configuration 400, the ue may support monitoring PDCCH candidates in one or more USS sets on the SCell and in one or more USS sets on the PCell/PSCell.

The base station may transmit to the UE a PDCCH (PCell/PSCell PDSCH/PUSCH 616) for scheduling a PDSCH or PUSCH on PCell/PSCell, among PDCCH candidates in one or more CSSs on PCell/PSCell (PCell/PSCell CSS 612), one or more USSs on PCell/PSCell (PCell/PSCell USS 614), and one or more USSs on SCell (first SCell USS 652). The base station may also transmit a PDCCH for scheduling PDSCH or PUSCH on the SCell (SCell PDSCH/PUSCH 656) to the UE in PDCCH candidates in one or more USSs on the SCell (second SCell USS 654).

The UE may receive a configuration for one or more PDCCH candidates in the one or more PCell/PSCell CSSs 612, the one or more PCell/PSCell USSs 614, and the one or more first SCell USSs 652 for a PDCCH including scheduling data for the first cell. Based on the configuration(s), the UE may monitor one or more PCell/PSCell CSSs 612, one or more PCell/PSCell USSs 614, and one or more first SCell USSs 652 to receive PDCCHs scheduling PCell/PSCell PDSCH/PUSCH 616. As part of monitoring, the UE may monitor non-overlapping CCEs based on the CSS set(s) and USS set(s), and may attempt to perform blind decoding of PDCCH candidates based on the CSS set(s) and USS set(s).

One or more PCell/PSCell USS 614 may support oversubscription of PDCCH candidates for one or more types of search space sets. In some aspects, a UE that may support oversubscription of PDCCH candidates in one or more USS sets on the PCell/PSCell may be configured with PDCCH oversubscription. As used herein, "oversubscribing" refers to slots or time spans in which BD or non-overlapping CCEs exceed a corresponding threshold. In some aspects, the base station may avoid oversubscription of the UE by not configuring/scheduling the UE in a manner that exceeds the threshold(s) of the slot or monitoring span. In some aspects, the UE may check the number of BD and non-overlapping CCEs in a slot or PDCCH monitoring span and if the number(s) exceeds a corresponding threshold, the UE may determine not to monitor PDCCH candidates for one or more USS sets. For example, the CSS set in the slot may not be oversubscribed beyond a CSS set threshold (such as threshold 710 in fig. 7, for example). If the UE determines that BD for a set of USSs exceeds the threshold 710 in a particular time slot, the UE may skip monitoring one or more sets of USSs. Similarly, if the UE determines that the number of non-overlapping CCEs for a CSS set exceeds the threshold 710 in a particular slot, the UE may skip monitoring one or more CSS sets. The base station may avoid configuring the UE to have a CSS set that exceeds the threshold 710. Similar to CSS, USS on SCell may have scheduling restrictions based on a threshold (such as threshold 712 in fig. 7, for example). Conversely, the set of USSs on the SCell may extend beyond the threshold 710 in a time slot or time span, which may be referred to as oversubscription. In some aspects, the network may configure USS sets on both PCell/PSCell and SCell, and the network may clarify whether and/or how to perform PDCCH oversubscription for one or more PCell/PSCell USSs 614. The network may use higher layer configurations to implement PDCCH oversubscription for the PCell/PSCell. That is, the network including the base station may determine a higher layer configuration indicating a first maximum BD number for PDCCH candidates on the PCell/PSCell and a second threshold indicating a second maximum non-overlapping CCE number, and the base station may transmit the higher layer configuration to the UE. The UE may monitor PDCCH candidates based on higher layer configurations received from the base station. Since the determination of the first and second thresholds is based on higher layer configuration, the actual number of BD and non-overlapping CCEs on one of the PCell/PSCell and SCell is affected by PDCCH monitoring on the other of the PCell/PSCell and SCell regardless of the number of BDs and CCEs allocated for the SCell. Monitoring of PDCCH candidates may be performed per slot or per span. Multiple scheduled cells may use different SCSs or the same SCS.

Fig. 7 is an example 700 of a cross-slot BD for cross-carrier scheduling of wireless communication methods. Example 700 may indicate BD 720 for USS set on SCell, BD 730 for USS set on PCell/PSCell, and BD 740 for CSS set on PCell/PSCell. The example 700 may be associated with a UE that may support PDCCH candidates in one or more USS sets on an SCell and in one or more USS sets on a PCell/PSCell. Here, example 700 indicates BD, but the present disclosure is not limited thereto, and example 700 may indicate non-overlapping CCEs. Further, example 700 indicates that BD is provided on a slot basis, but the present disclosure is not limited thereto, and example 700 may be provided according to per PDCCH monitoring span.

In some aspects, the network may configure the first and second thresholds to reserve a maximum number of PDCCH candidates for one or more CSS sets and one or more USS sets (i.e., one or more PCell/PSCell CSSs 612 and one or more PCell/PSCell USSs 614) on the PCell/PSCell. That is, the first threshold may indicate a first maximum BD number and a second threshold.

The maximum available number of BD and non-overlapping CCEs for PDCCH candidates of a set of USSs (i.e., one or more first SCell USS 652) scheduling PDSCH/PUSCH on PCell/PSCell on SCell may be determined based on a first threshold and a second threshold.

The network may configure a first threshold indicating a first maximum BD number for PDCCH candidates on the PCell/PSCell and a second threshold indicating a second maximum non-overlapping CCE number. The first threshold and the second threshold may be transmitted to the UE, and the UE may receive an indication of the first threshold and the second threshold. The indication of the first threshold and the second threshold may be transmitted via an RRC message. That is, the RRC message transmitted by the base station to the UE may include RRC parameters indicating the number of BD and non-overlapping CCEs allocated for one or more CSSs and one or more USSs on the PCell/PSCell, e.g., virtual per-cell limits (or virtual/configurable per-scheduling-cell limits), virtual/configurable PCell/PSCell limits (virtual/configurable PCell/PSCell limits), etc. The parameter may be configurable and may have a range from a maximum of BD/CCE numbers for one or more CSSs across PCell/PSCell of all slots to a scheduled cell restriction that is derived as the smaller of a single cell restriction and a CA restriction. The CA limit may be derived based on the number of DL cells for CA, reported UE capabilities (e.g., pdcch-blind detect CA), and reference SCS.

In some aspects, after the network configures a first threshold indicating a first maximum number of BDs for PDCCH candidates on the PCell/PSCell and a second threshold indicating a second maximum number of non-overlapping CCEs, the network may oversubscribe PDCCHs for one or more USSs on the PCell/PSCell within the first and second thresholds of BDs on the SCell and the maximum number of non-overlapping CCEs. That is, the network may allocate PDCCH candidates in one or more USSs on a PCell/PSCell that exceed the maximum of BD and non-overlapping CCE numbers across one or more CSSs on that PCell/PSCell for all slots within a first threshold that indicates a first maximum number of BDs on that PCell/PSCell and a second threshold that indicates a second maximum number of non-overlapping CCEs on that PCell/PSCell. The number of BDs available for PDCCH candidates on the SCell may be determined as the total BD limit minus the RRC configured first threshold number of BDs.

Referring to example 700, a first threshold 712 indicating a maximum BD number for CSS and/or USS on the PCell/PSCell may be determined by a network, and the network may transmit an indication of the first threshold to the UE via an RRC message. The RRC configured first threshold 712 may be configured to have a value greater than the maximum BD number 710 on the PCell/PSCell across slots. Here, the maximum BD number 710 on PCell/PSCell across slots is BD number 742 on PCell/PSCell on slot 2. The network may configure one or more USSs on the SCell such that PDCCH oversubscription is not configured. On the other hand, the network may configure one or more USSs on the PCell/PSCell such that the PDCCH may be oversubscribed based on a first threshold 712 indicating a maximum number of BDs for CSS and/or USSs on the PCell/PSCell. That is, the network may configure USS on the PCell/PSCell that exceeds the maximum BD number 710 and is within a first threshold 712.

In response to receiving a PDCCH candidate in one or more USSs on a network oversubscribed PCell/PSCell exceeding a maximum of BD and non-overlapping CCE numbers for one or more CSSs on the PCell/PSCell across all slots, the UE may check and determine that at least one USS of the one or more USSs configured on the PCell/PSCell is scheduled to exceed a maximum of BD and non-overlapping CCE numbers for one or more CSSs on the PCell/PSCell across all slots. The UE may determine not to monitor PDCCH candidates for the at least one USS of the one or more USSs configured on the PCell/PSCell, the USS being scheduled beyond a maximum value for BD and non-overlapping CCE numbers of the one or more CSSs on the PCell/PSCell across all slots.

In some aspects, higher layer configurations/parameters may be configured for example 500 illustrated in fig. 5 and example 700 illustrated in fig. 7. That is, the network may determine a first threshold indicating a first maximum number of BDs on the PCell/PSCell and a second threshold indicating a second maximum number of non-overlapping CCEs. The network may allocate the remaining number of BDs and non-overlapping CCEs available for the SCell. Accordingly, the PDCCH may be oversubscribed for one or more USSs on the PCell/PSCell.

The total number of BD and non-overlapping CCEs allocated for PDCCH candidates for scheduling PCell/PSCell cannot exceed the per-cell limit (or the scheduled cell limit). That is, the total number of BDs and non-overlapping CCEs allocated for PDCCH candidates on the PCell/PSCell and SCell for each slot may not exceed the scheduled cell limit. The scheduled cell restriction may indicate a first maximum number of BDs for the PDCCH candidate and a second maximum number of non-overlapping CCEs for the PDCCH candidate, and the total number of BDs allocated for the PDCCH candidate may not exceed the first maximum number of BDs for the PDCCH candidate, and the total number of non-overlapping CCEs allocated for the PDCCH candidate may not exceed the second maximum number of non-overlapping CCEs for the PDCCH candidate.

In one aspect, different SCS may be used for PDCCH candidates on PCell/PSCell and on SCell, with the lower SCS between the two SCSs being used as a reference SCS for determining per cell restrictions. That is, the PCell/PSCell may have a first SCS and the SCell may have a second SCS, and when the first SCS is greater than the second SCS, the network may use the second SCS of the SCell to determine the scheduled cell restriction. When the second SCS of the SCell is greater than the first SCS of the PCell/PSCell, the network may use the first SCS of the PCell/PSCell to determine the scheduled cell restriction. In another aspect, the same SCS may be used for PDCCH candidates on the PCell/PSCell and on the SCell, and the network may use the same SCS associated with the PCell/PSCell and the SCell to determine the scheduled cell restriction.

In another aspect, the UE may report PDCCH blind decoding capability for CA supported by the UE to the network. For example, the UE may signal to the base station a parameter (e.g., PDCCH-blind detect CA) indicating PDCCH blind decoding capability for CA supported by the UE. The network including the base station may determine the scheduled cell restriction based on the smaller of the single cell restriction and the CA restriction. The CA limit may be derived based on the number of DL cells for CA, reported UE capabilities (e.g., pdcch-blind detect CA), and reference SCS (e.g., 15 kHz).

In one aspect, the maximum number of BD and non-overlapping CCEs used to schedule PDCCH candidates for PCell/PSCell may be configured by a network including base stations, and the configuration may be indicated to the UE using RRC messages. The values of the maximum number of BD and non-overlapping CCEs for scheduling PDCCH candidates for PCell/PSCell may be configured ranging from the maximum number of BD and non-overlapping CCEs for CSS sets across all slots on PCell/PSCell to a scheduled cell restriction that is derived as the smaller of a single cell restriction and a CA restriction. The CA limit may be derived based on the number of DL cells for CA, reported UE capabilities (e.g., pdcch-blind detect CA), and reference SCS (e.g., 15 kHz).

The maximum number of BD and non-overlapping CCEs for PDCCH candidates for scheduling PCell/PSCell on SCell may be determined by subtracting a first threshold indicative of a first maximum number of BD candidates for scheduling PCell/PSCell and a second threshold indicative of a second maximum number of non-overlapping CCEs from the scheduled cell restriction.

Fig. 8 is a call flow diagram 800 of a wireless communication method. The call flow diagram 800 may include a UE 802 and a base station 804. The base station 804 may configure a first threshold indicating a maximum number of BD and non-overlapping CCEs for PDCCH candidates on the PCell/PSCell and transmit to the UE 802 a configuration for PDCCH candidates in CSS or USS on the PCell/PSCell and USS on the SCell for scheduling PDCCH for data of the PCell/PSCell. Base station 804 may transmit at least one PDCCH in the PDCCH candidates. The UE 802 may receive the configuration and receive the PDCCH by blind decoding a PDCCH candidate in at least one of a CSS or USS configured on the PCell/PSCell and a USS configured on the SCell. USS configured on PCell/PSCell may support PDCCH oversubscription.

At 806, the base station 804 may receive an indication from the UE 802 to support USSs on the first cell, wherein the configuration for USSs on the first cell is based on the UE 802 supporting one or more USSs on the first cell. The UE 802 may transmit an indication to the base station 804 to support USSs on the first cell, wherein the configuration for USSs on the first cell is based on the UE 802 supporting one or more USSs on the first cell.

At 808, the base station 804 may receive parameters from the UE 802 indicating PDCCH blind decoding capability for CA supported by the UE 802. The UE 802 may report to the base station 804 a parameter indicating PDCCH blind decoding capability for CA supported by the UE 802. In some aspects, base station 804 may determine the scheduled cell restriction based on the lesser of the single cell restriction and the CA restriction. The CA limit may be derived based on the number of DL cells for CA, the reported UE 802 capabilities, and the reference SCS.

At 810, base station 804 can configure a first threshold that indicates a first maximum BD for PDCCH candidates on a first cell and a second threshold that indicates a second maximum non-overlapping CCE number. In one aspect, the base station 804 may configure a first threshold indicating a first maximum number of BDs for CSSs on the first cell and a second threshold indicating a second maximum number of non-overlapping CCEs to be based on time slots having a highest number of BDs and non-overlapping CCEs for the CSSs, configure a third maximum number of BDs for USSs on the second cell to be based on the scheduled cell limit of BDs minus the first threshold, and configure a fourth maximum number of non-overlapping CCEs for those USSs to be based on the scheduled cell limit of non-overlapping CCEs minus the second threshold. In an aspect, the one or more USS may be configured on the first cell based on an indication received from the UE 802 at 806 that the UE 802 supports USS on the first cell.

At 812, the base station 804 may transmit to the UE 802 a configuration for one or more PDCCH candidates configured in one or more CSSs on the first cell and one or more USS on the second cell for a PDCCH including scheduling data for the first cell. The UE 802 may receive a configuration for one or more PDCCH candidates in one or more CSSs configured on a first cell and one or more USS configured on a second cell from the base station 804 for a PDCCH including scheduling data for the first cell. In some aspects, the first cell comprises at least one of a PCell or a PSCell, and the second cell comprises an SCell. The configuration may further include one or more PDCCH candidates in one or more USS configured on the first cell.

At 814, the base station 804 may transmit an indication to the UE 802 of a first threshold indicating a first maximum BD number for PDCCH candidates on the first cell and a second threshold indicating a second maximum non-overlapping CCE number. The UE 802 may receive an indication of a first threshold indicating a first maximum number of BDs for PDCCH candidates on a first cell and a second threshold indicating a second maximum number of non-overlapping CCEs from the base station 804.

In one aspect, the first threshold and the second threshold may be transmitted and received via RRC messages. In another aspect, base station 804 may transmit an RRC message to configure a first threshold indicating a first maximum BD number for PDCCH candidates on the first cell and a second threshold indicating a second maximum non-overlapping CCE number. The UE may determine a third threshold for a third maximum BD number and a fourth threshold for a fourth maximum non-overlapping CCE number of the CSSs on the first cell based on the time slot having the highest number of BDs and non-overlapping CCEs for the CSS, and the first threshold may have a value greater than or equal to the third threshold and the second threshold may have a value greater than or equal to the fourth threshold. That is, the first threshold indicating the first maximum BD number configured by the RRC message may be greater than or equal to a third threshold indicating a third maximum BD number determined based on the slot having the highest BD number, and the second threshold indicating the second maximum non-overlapping CCE number may be greater than or equal to a fourth threshold indicating a fourth maximum non-overlapping CCE number determined based on the slot having the highest non-overlapping CCE number.

At 816, the base station 804 transmits at least one PDCCH to the UE 802 for a PDCCH including a schedule for the first cell based on the configuration and within a scheduled cell limit including a first BD total number and a second non-overlapping CCE total number for the PDCCH candidate, at least one of the one or more CSSs configured on the first cell or the one or more USSs and one or more PDCCH candidates configured on the second cell. The UE 802 may receive at least one PDCCH from the base station 804 for a PDCCH including scheduling for the first cell in at least one of the one or more CSSs configured on the first cell or the one or more USSs configured on the second cell based on the configuration and within the scheduled cell limit including the first BD total number and the second non-overlapping CCE total number for the PDCCH candidates.

In one aspect, the scheduled cell restriction including the first BD total number and the second non-overlapping CCE total number for the PDCCH candidates may be based on a smaller SCS or the same SCS associated with the first cell or the second cell. In another aspect, the scheduled cell restriction may have a value less than or equal to the CA restriction of the first cell and the second cell. In another aspect, the scheduled cell restriction may be set to be less than or equal to the PDCCH blind decoding capability supported by the UE 802, the PDCCH blind decoding capability indicated by the parameters received at 808.

At 818, the ue 802 may determine that at least one of the first USS configured on the first cell is scheduled to exceed a first threshold or a second threshold of the first cell.

At 820, the ue 802 may determine not to monitor PDCCH candidates for at least one of the first USSs scheduled to exceed the first threshold or the second threshold in response to determining that the at least one of the first USSs configured on the first cell is scheduled to exceed the first threshold or the second threshold at 818.

At 822, the ue 802 may perform blind decoding of the one or more PDCCH candidates in at least one of the one or more CSSs on the first cell and the one or more USSs on the second cell based on the configuration and within the scheduled cell limit comprising the first BD total number and the second non-overlapping CCE total number for the PDCCH candidates. The UE 802 may further perform blind decoding of the one or more CSSs on the first cell and the one or more USSs on the first cell within the first threshold and the second threshold based on the configuration received at 812.

At 824, base station 804 may transmit PDSCH to UE 802 or receive PUSCH from UE 802 on the first cell based on the PDCCH transmitted at 816. The UE 802 may receive PDSCH from the base station 804 or transmit PUSCH to the base station 804 on the first cell based on the PDCCH decoded at 822.

Fig. 9 is a flow chart 900 of a method of wireless communication. The method may be performed by a UE (e.g., UE 104; device 1302). The UE may receive a configuration for PDCCH candidates in CSS or USS on PCell/PSCell and USS on SCell from the base station for PDCCH scheduling data for PCell/PSCell. The UE may receive at least one PDCCH from the base station among the PDCCH candidates by blindly decoding the PDCCH candidates in at least one of the CSS or USSs configured on the PCell/PSCell and USSs configured on the Scell. USS configured on PCell/PSCell may support PDCCH oversubscription.

At 902, the UE may transmit an indication to the base station 804 to support USSs on the first cell, wherein the configuration for USSs on the first cell is based on the UE supporting one or more USSs on the first cell. For example, at 806, the UE 802 may transmit an indication to the base station 804 to support USSs on the first cell, wherein the configuration for USSs on the first cell is based on the UE 802 supporting one or more USSs on the first cell. Further, 902 can be performed by PDCCH cross-carrier scheduling component 1340.

At 904, the UE may report to the base station a parameter indicating PDCCH blind decoding capability for CA supported by the UE. In some aspects, the base station may determine the scheduled cell restriction based on the lesser of the single cell restriction and the CA restriction. The CA limit may be derived based on the number of DL cells for CA, the reported UE capabilities, and the reference SCS. For example, at 808, the UE 802 may report to the base station 804 a parameter indicating PDCCH blind decoding capability for CA supported by the UE 802. Further, 904 may be performed by PDCCH cross-carrier scheduling component 1340.

At 906, the ue may receive a configuration for one or more PDCCH candidates in one or more CSSs configured on the first cell and one or more USS configured on the second cell from the base station, the configuration for a PDCCH including scheduling data for the first cell. In some aspects, the first cell comprises at least one of a PCell or a PSCell, and the second cell comprises an SCell. The configuration may further include one or more PDCCH candidates in one or more USS configured on the first cell. For example, at 812, the ue 802 may receive a configuration for one or more PDCCH candidates configured in one or more CSSs on the first cell and one or more USS on the second cell from the base station 804 for a PDCCH including scheduling data for the first cell. Further, 906 can be performed by PDCCH cross-carrier scheduling component 1340.

At 908, the ue may receive an indication of a first threshold indicating a first maximum number of BDs for PDCCH candidates on the first cell and a second threshold indicating a second maximum number of non-overlapping CCEs from the base station. In one aspect, the first threshold and the second threshold may be transmitted and received via RRC messages. In another aspect, the UE may receive an RRC message to configure a first threshold indicating a first maximum BD number for PDCCH candidates on the first cell and a second threshold indicating a second maximum non-overlapping CCE number. The UE may determine a third threshold for a third maximum BD number and a fourth threshold for a fourth maximum non-overlapping CCE number of the CSSs on the first cell based on the time slot having the highest number of BDs and non-overlapping CCEs for the CSS, and the first threshold may have a value greater than or equal to the third threshold and the second threshold may have a value greater than or equal to the fourth threshold. That is, the first threshold indicating the first maximum BD number configured by the RRC message may be greater than or equal to a third threshold indicating a third maximum BD number determined based on the slot having the highest BD number, and the second threshold indicating the second maximum non-overlapping CCE number may be greater than or equal to a fourth threshold indicating a fourth maximum non-overlapping CCE number determined based on the slot having the highest non-overlapping CCE number. For example, at 814, the ue 802 may receive an indication of a first threshold indicating a first maximum number of BDs for PDCCH candidates on the first cell and a second threshold indicating a second maximum number of non-overlapping CCEs from the base station 804. Further, 908 may be performed by PDCCH cross-carrier scheduling component 1340.

At 910, the ue may receive at least one PDCCH for a PDCCH including scheduling for the first cell based on the configuration and within a scheduled cell limit including a first BD total number and a second non-overlapping CCE total number for the PDCCH candidate, at least one of the one or more CSSs configured on the first cell or the one or more USSs and one or more PDCCH candidates configured on the second cell. That is, the UE may monitor PDCCH candidates on the first cell and the second cell to receive PDCCHs transmitted by the base station. In one aspect, the scheduled cell restriction including the first BD total number and the second non-overlapping CCE total number for the PDCCH candidates may be based on a smaller SCS or the same SCS associated with the first cell or the second cell. In another aspect, the scheduled cell restriction may have a value less than or equal to the CA restriction of the first cell and the second cell. In another aspect, the scheduled cell restriction may be set to be less than or equal to the PDCCH blind decoding capability supported by the UE, the PDCCH blind decoding capability indicated by the parameters received at 904. For example, at 816, the ue 802 may receive at least one PDCCH from the base station 804 in one or more PDCCH candidates. Further, 910 may be performed by PDCCH cross-carrier scheduling component 1340.

At 912, the ue may determine that at least one of the first USS configured on the first cell is scheduled to exceed a first threshold or a second threshold of the first cell. For example, at 818, the ue 802 may determine that at least one of the first USSs configured on the first cell is scheduled to exceed a first threshold or a second threshold of the first cell. Further, 912 can be performed by PDCCH oversubscription component 1342.

At 914, the ue may determine not to monitor PDCCH candidates for the at least one of the first USS that is scheduled to exceed the first threshold or the second threshold in response to determining that the at least one of the first USS that is configured on the first cell is scheduled to exceed the first threshold or the second threshold and is within the first threshold at 912. For example, at 820, the ue 802 may determine not to monitor PDCCH candidates for the at least one USS of the first USS that is scheduled to exceed the first threshold or the second threshold. Further, 914 can be performed by PDCCH oversubscription component 1342.

At 916, the ue may perform blind decoding of the one or more PDCCH candidates in at least one of the one or more CSSs on the first cell and the one or more USSs on the second cell based on the configuration and within the scheduled cell limit comprising the first BD total number and the second non-overlapping CCE total number for the PDCCH candidates. The UE may further perform blind decoding of the one or more CSSs on the first cell and the one or more USSs on the first cell within the first threshold and the second threshold based on the configuration received at 906. For example, at 822, the ue 802 may perform blind decoding of the one or more PDCCH candidates in at least one of the one or more CSSs on the first cell and the one or more USSs on the second cell based on the configuration and within the scheduled cell limit including the first BD total number and the second non-overlapping CCE total number for the PDCCH candidates. Further, 916 can be performed by PDCCH decoding component 1344.

At 918, the ue may receive PDSCH from or transmit PUSCH to the base station on the first cell based on the PDCCH decoded at 916. For example, at 824, the ue 802 may receive a PDSCH from the base station 804 or transmit a PUSCH to the base station 804 on the first cell based on the PDCCH decoded at 822. Further, 918 can be performed by an uplink/downlink communication component 1346.

Fig. 10 is a flow chart 1000 of a method of wireless communication. The method may be performed by a UE (e.g., UE 104; device 1302). The UE may receive a configuration for PDCCH candidates in CSS or USS on PCell/PSCell and USS on SCell from the base station for PDCCH scheduling data for PCell/PSCell. The UE may receive at least one PDCCH from the base station among the PDCCH candidates by blind decoding at least one of the CSS or USS configured on the PCell/PSCell and the PDCCH candidates in the USS configured on the Scell. USS configured on PCell/PSCell may support PDCCH oversubscription.

At 1006, the ue may receive, from the base station, a configuration for one or more PDCCH candidates configured in one or more CSSs on the first cell and one or more USS on the second cell, the configuration for a PDCCH including scheduling data for the first cell. In some aspects, the first cell comprises at least one of a PCell or a PSCell, and the second cell comprises an SCell. The configuration may further include one or more PDCCH candidates in one or more USS configured on the first cell. For example, at 812, the ue 802 may receive a configuration for one or more PDCCH candidates configured in one or more CSSs on the first cell and one or more USS on the second cell from the base station 804 for a PDCCH including scheduling data for the first cell. Further, 1006 can be performed by PDCCH cross-carrier scheduling component 1340.

At 1016, the ue may perform blind decoding of the one or more PDCCH candidates in at least one of the one or more CSSs on the first cell and the one or more USSs on the second cell based on the configuration and within the scheduled cell limit comprising the first BD total number and the second non-overlapping CCE total number for the PDCCH candidates. The UE may further perform blind decoding of the one or more CSSs on the first cell and the one or more USSs on the first cell within the first threshold and the second threshold based on the configuration received at 1006. For example, at 822, the ue 802 may perform blind decoding of the one or more PDCCH candidates in at least one of the one or more CSSs on the first cell and the one or more USSs on the second cell based on the configuration and within the scheduled cell limit including the first BD total number and the second non-overlapping CCE total number for the PDCCH candidates. Further, 1016 may be performed by PDCCH decoding component 1344.

Fig. 11 is a flow chart 1100 of a method of wireless communication. The method may be performed by a base station (e.g., base station 102/180; device 1402). The base station may configure a first threshold indicating a maximum number of BD and non-overlapping CCEs for PDCCH candidates on the PCell/PSCell and transmit to the UE a configuration for PDCCH candidates in CSS or USS on the PCell/PSCell and USS on the SCell for PDCCH scheduling data for the PCell/PSCell. The base station may transmit at least one PDCCH among the PDCCH candidates. USS configured on PCell/PSCell may support PDCCH oversubscription.

At 1102, a base station may receive an indication to support USSs on a first cell, wherein a configuration for USSs on the first cell is based on a UE supporting one or more USSs on the first cell. In some aspects, the base station may determine the scheduled cell restriction based on the lesser of the single cell restriction and the CA restriction. The CA limit may be derived based on the number of DL cells for CA, the reported UE capabilities, and the reference SCS. For example, at 806, the base station 804 may receive an indication from the UE 802 to support USSs on the first cell, wherein the configuration for USSs on the first cell is based on the UE 802 supporting one or more USSs on the first cell. Further, 1102 can be performed by PDCCH cross-carrier scheduling component 1440.

At 1104, the base station may receive from the UE a parameter indicating PDCCH blind decoding capability for CA supported by the UE. For example, at 808, the base station 804 may receive parameters from the UE 802 indicating PDCCH blind decoding capability for CA supported by the UE 802. Further, 1104 can be performed by PDCCH cross-carrier scheduling component 1440.

At 1105, the base station may configure a first threshold indicating a first maximum BD for PDCCH candidates on the first cell and a second threshold indicating a second maximum non-overlapping CCE number. In one aspect, the base station may configure a first threshold indicating a first maximum BD number of CSSs on the first cell and a second threshold indicating a second maximum non-overlapping CCE number to be based on timeslots having a highest number of BDs and non-overlapping CCEs for these CSSs, configure a third maximum BD number for USSs on the second cell to be based on the BD's scheduled cell limit minus the first threshold, and configure a fourth maximum non-overlapping CCE number for USSs on the second cell to be based on the non-overlapping CCE's scheduled cell limit minus the second threshold. In one aspect, one or more USS may be configured on the first cell based on the indication received from the UE at 1102 that the UE supports USS on the first cell. For example, at 810, base station 804 can configure a first threshold that indicates a first maximum BD for PDCCH candidates on a first cell and a second threshold that indicates a second maximum non-overlapping CCE number. Further, 1105 may be performed by PDCCH cross-carrier scheduling component 1440.

At 1106, the base station may transmit to the UE a configuration for one or more PDCCH candidates configured in one or more CSSs on the first cell and in one or more USS on the second cell, the configuration for a PDCCH including scheduling data for the first cell. In some aspects, the first cell comprises at least one of a PCell or a PSCell, and the second cell comprises an SCell. The configuration may further include one or more PDCCH candidates in one or more USS configured on the first cell. For example, at 816, the base station 804 may transmit to the UE 802 a configuration for one or more PDCCH candidates configured in one or more CSSs on the first cell and one or more USS on the second cell for a PDCCH including scheduling data for the first cell. Furthermore, 1106 may be performed by PDCCH cross-carrier scheduling component 1440.

At 1108, the base station may transmit an indication to the UE of a first threshold indicating a first maximum number of BDs for PDCCH candidates on the first cell and a second threshold indicating a second maximum number of non-overlapping CCEs. In one aspect, the first threshold and the second threshold may be transmitted and received via RRC messages. In another aspect, the base station may transmit an RRC message to configure a first threshold indicating a first maximum BD number for PDCCH candidates on the first cell and a second threshold indicating a second maximum non-overlapping CCE number. The UE may determine a third threshold for a third maximum BD number and a fourth threshold for a fourth maximum non-overlapping CCE number of the CSSs on the first cell based on the time slot having the highest number of BDs and non-overlapping CCEs for the CSS, and the first threshold may have a value greater than or equal to the third threshold and the second threshold may have a value greater than or equal to the fourth threshold. That is, the first threshold indicating the first maximum BD number configured by the RRC message may be greater than or equal to a third threshold indicating a third maximum BD number determined based on the slot having the highest BD number, and the second threshold indicating the second maximum non-overlapping CCE number may be greater than or equal to a fourth threshold indicating a fourth maximum non-overlapping CCE number determined based on the slot having the highest non-overlapping CCE number. For example, at 814, the base station 804 may transmit an indication to the UE 802 of a first threshold indicating a first maximum number of BDs for PDCCH candidates on the first cell and a second threshold indicating a second maximum number of non-overlapping CCEs. Further, 1108 can be performed by PDCCH cross-carrier scheduling component 1440.

At 1110, the base station may transmit at least one PDCCH to the UE for a PDCCH including scheduling for the first cell based on the configuration and within a scheduled cell limit including a first BD total number and a second non-overlapping CCE total number for the PDCCH candidate, at least one of the one or more CSSs or the one or more USSs configured on the first cell, and one or more PDCCH candidates of the one or more USSs configured on the second cell. In one aspect, the scheduled cell restriction including the first BD total number and the second non-overlapping CCE total number for the PDCCH candidates may be based on a smaller SCS or the same SCS between the first cell and the second cell. In another aspect, the scheduled cell restriction may have a value less than or equal to the CA restriction of the first cell and the second cell. In another aspect, the scheduled cell restriction may be set to be less than or equal to the PDCCH blind decoding capability supported by the UE, the PDCCH blind decoding capability indicated by the parameters received at 1104. For example, at 816, the base station 804 may transmit at least one PDCCH to the UE 802 in one or more PDCCH candidates in at least one of the one or more CSSs or the one or more USSs. Further, 1110 may be performed by PDCCH transmitting component 1442.

At 1118, the base station may transmit or receive PDSCH to or from the UE on the first cell based on the PDCCH transmitted at 1110. For example, at 824, the base station 804 may transmit a PDSCH to the UE 802 or receive a PUSCH from the UE 802 on the first cell based on the PDCCH transmitted at 816. Further, 1118 can be implemented by an uplink/downlink communication component 1446.

Fig. 12 is a flow chart 1200 of a method of wireless communication. The method may be performed by a base station (e.g., base station 102/180; device 1402). The base station may configure a first threshold indicating a maximum number of BD and non-overlapping CCEs for PDCCH candidates on the PCell/PSCell and transmit to the UE a configuration for PDCCH candidates in CSS or USS on the PCell/PSCell and USS on the SCell for PDCCH scheduling data for the PCell/PSCell. The base station may transmit at least one PDCCH among the PDCCH candidates. USS configured on PCell/PSCell may support PDCCH oversubscription.

At 1205, the base station may configure a first threshold indicating a first maximum BD for PDCCH candidates on the first cell and a second threshold indicating a second maximum non-overlapping CCE number. In one aspect, the base station may configure a first threshold for indicating a first maximum BD number of CSSs on the first cell and a second threshold for indicating a second maximum non-overlapping CCE number to be based on timeslots having a highest number of BDs and non-overlapping CCEs for these CSSs, configure a third maximum BD number of USSs on the second cell to be based on the BD's scheduled cell limit minus the first threshold, and configure a fourth maximum non-overlapping CCE number of USSs on the second cell to be based on the non-overlapping CCE's scheduled cell limit minus the second threshold. In an aspect, one or more USS may be configured on the first cell based on the indication received from the UE at 1202 that the UE supports USS on the first cell. For example, at 810, base station 804 may configure a first threshold that indicates a first maximum BD for PDCCH candidates on a first cell and a second threshold that indicates a second maximum non-overlapping CCE number. Further, 1205 may be performed by PDCCH cross-carrier scheduling component 1440.

At 1206, the base station may transmit to the UE a configuration for one or more PDCCH candidates configured in one or more CSSs on the first cell and one or more USS on the second cell, the configuration for a PDCCH including scheduling data for the first cell. In some aspects, the first cell comprises at least one of a PCell or a PSCell, and the second cell comprises an SCell. The configuration may further include one or more PDCCH candidates in one or more USS configured on the first cell. For example, at 816, the base station 804 may transmit to the UE 802 a configuration for one or more PDCCH candidates configured in one or more CSSs on the first cell and in one or more USS on the second cell, the configuration for a PDCCH including scheduling data for the first cell. Further, 1206 may be performed by PDCCH cross-carrier scheduling component 1440.

At 1210, the base station may transmit at least one PDCCH to the UE for a PDCCH including scheduling for the first cell based on the configuration and within a scheduled cell limit including a first BD total number and a second non-overlapping CCE total number for the PDCCH candidate, at least one of the one or more CSSs or the one or more USSs configured on the first cell, and one or more PDCCH candidates of the one or more USSs configured on the second cell. In one aspect, the scheduled cell restriction including the first BD total number and the second non-overlapping CCE total number for the PDCCH candidates may be based on a smaller SCS or the same SCS between the first cell and the second cell. In another aspect, the scheduled cell restriction may have a value less than or equal to the CA restriction of the first cell and the second cell. In another aspect, the scheduled cell limit may be set to be less than or equal to the PDCCH blind decoding capability supported by the UE, the PDCCH blind decoding capability indicated by the parameters received at 1204. For example, at 816, the base station 804 may transmit at least one PDCCH to the UE 802 in one or more PDCCH candidates in at least one of the one or more CSSs or the one or more USSs. Further, 1210 may be performed by PDCCH transmitting component 1442.

Fig. 13 is a diagram 1300 illustrating an example of a hardware implementation of a device 1302. The device 1302 may be a UE, a component of a UE, or may implement UE functionality. In some aspects, the device 1302 may include a cellular baseband processor 1304 (also referred to as a modem) coupled to a cellular RF transceiver 1322. In some aspects, the device 1302 may further include one or more Subscriber Identity Module (SIM) cards 1320, an application processor 1306 coupled to the Secure Digital (SD) card 1308 and the screen 1310, a bluetooth module 1312, a Wireless Local Area Network (WLAN) module 1314, a Global Positioning System (GPS) module 1316, or a power supply 1318. The cellular baseband processor 1304 communicates with the UE 104 and/or BS102/180 via a cellular RF transceiver 1322. The cellular baseband processor 1304 may include a computer-readable medium/memory. The computer readable medium/memory may be non-transitory. The cellular baseband processor 1304 is responsible for general processing, including the execution of software stored on the computer-readable medium/memory. The software, when executed by the cellular baseband processor 1304, causes the cellular baseband processor 1304 to perform the various functions described supra. The computer readable medium/memory can also be used for storing data that is manipulated by the cellular baseband processor 1304 when executing software. Cellular baseband processor 1304 further includes a receiving component 1330, a communication manager 1332, and a transmitting component 1334. The communications manager 1332 includes the one or more illustrated components. The components within the communication manager 1332 may be stored in a computer-readable medium/memory and/or configured as hardware within the cellular baseband processor 1304. The cellular baseband processor 1304 may be a component of the UE 350 and may include the memory 360 and/or at least one of: a TX processor 368, an RX processor 356, and a controller/processor 359. In one configuration, the device 1302 may be a modem chip and include only the baseband processor 1304, and in another configuration, the device 1302 may be an entire UE (e.g., see 350 of fig. 3) and include additional modules of the device 1302.

Communication manager 1332 includes PDCCH cross-carrier scheduling component 1340 configured to: transmitting an indication of support of USS on the first cell; reporting a parameter indicating PDCCH blind decoding capability for CA supported by the UE; receiving a configuration for one or more PDCCH candidates in one or more CSSs configured on a first cell and in one or more USS configured on a second cell, the configuration for a PDCCH comprising scheduling data for the first cell; receiving an indication of a first threshold indicating a first maximum number of BDs for PDCCH candidates on a first cell and a second threshold indicating a second maximum number of non-overlapping CCEs; and receiving at least one PDCCH in one or more PDCCH candidates, e.g., as described in connection with 902, 904, 906, 908, 910, and 1006. The communication manager 1332 further includes a PDCCH oversubscription component 1342 configured to determine that at least one of the first USSs configured on the first cell is scheduled to exceed a first threshold or a second threshold of the first cell, and to determine not to monitor PDCCH candidates of the at least one of the first USSs scheduled to exceed the first threshold or the second threshold, e.g., as described in connection with 912 and 914. The communication manager 1332 further includes a PDCCH decoding component 1344 configured to perform blind decoding of one or more PDCCH candidates in at least one of the one or more CSSs or the one or more USSs on the first cell and the one or more USSs on the second cell, e.g., as described in connection with 916 and 1016. The communication manager 1332 further includes an uplink/downlink communication component 1346 configured to receive PDSCH from or transmit PUSCH to a base station on a first cell, e.g., as described in connection with 918.

The apparatus may include additional components to perform each of the blocks of the algorithms in the flowcharts of fig. 8, 9, and 10. As such, each block in the flowcharts of fig. 8, 9, and 10 may be performed by a component and the apparatus may include one or more of those components. These components may be one or more hardware components specifically configured to perform the process/algorithm, implemented by a processor configured to perform the process/algorithm, stored in a computer-readable medium for implementation by a processor, or some combination thereof.

As shown, device 1302 may include various components configured for various functions. In one configuration, the device 1302, and in particular the cellular baseband processor 1304, comprises: means for receiving, from a base station, a configuration for one or more CSSs configured on a first cell and one or more PDCCH candidates configured on a second cell, the configuration for a PDCCH including scheduling data for the first cell, the first cell including at least one of a PCell or a PSCell, and the second cell including an SCell, and means for performing blind decoding of the one or more PDCCH candidates in the one or more USSs on the first cell and the one or more USSs on the second cell based on the configuration and within a scheduled cell limit including a first BD total number and a second non-overlapping CCE total number for the PDCCH candidates. The apparatus 1302 includes: means for reporting to the base station a parameter indicating PDCCH blind decoding capability for CA supported by the UE. The apparatus 1302 includes: the apparatus includes means for receiving a PDCCH in one or more PDCCH candidates and receiving a PDSCH on a first cell from or transmitting a PUSCH to a base station based on the PDCCH, and means for performing blind decoding of one or more CSSs on the first cell and one or more USSs on the first cell within a first threshold and a second threshold. The apparatus 1302 includes: means for determining that at least one of the first USSs configured on the first cell is scheduled to exceed a first threshold or a second threshold of the first cell, and means for determining not to monitor PDCCH candidates for the at least one of the first USSs scheduled to exceed the first threshold or the second threshold. The apparatus 1302 includes: means for transmitting an indication to support one or more USSs on the first cell, wherein the configuration for the one or more USSs on the first cell is based on the UE supporting the one or more USSs on the first cell. The apparatus may be one or more of the components in the device 1302 configured to perform the functions recited by the apparatus. As described above, device 1302 may include TX processor 368, RX processor 356, and controller/processor 359. As such, in one configuration, the device may be a TX processor 368, an RX processor 356, and a controller/processor 359 configured to perform the functions recited by the device.

Fig. 14 is a diagram 1400 illustrating an example of a hardware implementation of the device 1402. The device 1402 may be a network node. The device 1402 can be a base station, a component of a base station, or can implement base station functionality. In some aspects, the device 1302 may include a baseband unit 1404. The baseband unit 1404 may communicate with the UE 104 via a cellular RF transceiver 1422. In some aspects, the device 1402 may include a cellular RF transceiver 1422. The baseband unit 1404 may include a computer readable medium/memory. The baseband unit 1404 is responsible for general processing, including the execution of software stored on a computer-readable medium/memory. The software, when executed by the baseband unit 1404, causes the baseband unit 1404 to perform the various functions described supra. The computer-readable medium/memory may also be used for storing data that is manipulated by the baseband unit 1404 when executing software. The baseband unit 1404 further includes a receive component 1430, a communication manager 1432, and a transmit component 1434. The communication manager 1432 includes the one or more illustrated components. The components within the communication manager 1432 may be stored in a computer-readable medium/memory and/or configured as hardware within the baseband unit 1404. The baseband unit 1404 may be a component of the base station 310 and may include a memory 376 and/or at least one of the following: TX processor 316, RX processor 370, and controller/processor 375.

The communication manager 1432 includes a PDCCH cross-carrier scheduling component 1440 configured to: receiving an indication of support of USS on a first cell; receiving a parameter indicating PDCCH blind decoding capability for CA supported by the UE; configuring a first threshold indicating a first maximum BD for PDCCH candidates on the first cell and a second threshold indicating a second maximum non-overlapping CCE number; transmitting a configuration for one or more PDCCH candidates in one or more CSSs configured on a first cell and in one or more USS configured on a second cell, the configuration for a PDCCH comprising scheduling data for the first cell; and transmitting an indication of a first threshold indicating a first maximum number of BDs for PDCCH candidates on the first cell and a second threshold indicating a second maximum number of non-overlapping CCEs, e.g., as described in connection with 1102, 1104, 1105, 1106, 1108, 1205, and 1206. The communication manager 1432 further includes a PDCCH transmitting component 1442 configured to transmit at least one PDCCH to a UE in one or more of one or more CSSs or one or more USS candidates configured on a first cell and one or more PDCCH candidates configured on a second cell, e.g., as described in connection with 1110 and 1210. The communication manager 1432 further includes an uplink/downlink communication component 1446 configured to transmit or receive a PDSCH to or from a UE on the first cell, e.g., as described in connection with 1118.

The apparatus may include additional components to perform each of the blocks of the algorithms in the flowcharts of fig. 8, 10, and 11. As such, each block in the flowcharts of fig. 8, 10, and 11 may be performed by a component and the apparatus may include one or more of those components. These components may be one or more hardware components specifically configured to perform the process/algorithm, implemented by a processor configured to perform the process/algorithm, stored in a computer-readable medium for implementation by a processor, or some combination thereof.

As shown, device 1402 may include various components configured for various functions. In one configuration, the device 1402, specifically the baseband processing unit 1404, includes: means for configuring a first threshold value indicating a first maximum BD for PDCCH candidates on a first cell and a second threshold value indicating a second maximum non-overlapping CCE number; means for transmitting to the UE a configuration for one or more CSSs configured on the first cell and one or more PDCCH candidates of one or more USSs configured on the second cell, the configuration for a PDCCH including scheduling data for the first cell, the first cell including at least one of a PCell or a PSCell, and the second cell including an SCell, and means for transmitting to the UE at least one PDCCH for a PDCCH including scheduling for the first cell based on the configuration and within a scheduled cell limit including a first BD total number for the PDCCH candidates and a second non-overlapping CCE total number, at least one of the one or more CSSs or one or more USSs configured on the first cell and the one or more PDCCH candidates configured on the second cell. The device 1402 includes: means for receiving, from a UE, a parameter indicating PDCCH blind decoding capability for CA supported by the UE; transmitting a PDSCH to a UE or receiving a PUSCH from the UE on a first cell based on the PDSCH; and means for receiving an indication of support of one or more USSs on the first cell, wherein the configuration for the one or more USSs on the first cell is based on the UE supporting the one or more USSs on the first cell. The apparatus may be one or more of the components in device 1402 configured to perform the functions recited by the apparatus. As described above, device 1402 may include TX processor 316, RX processor 370, and controller/processor 375. As such, in one configuration, the device may be TX processor 316, RX processor 370, and controller/processor 375 configured to perform the functions recited by the device.

The apparatus may include a base station and a UE. The base station may configure a first threshold indicating a first maximum BD for PDCCH candidates on the first cell and a second threshold indicating a second maximum non-overlapping CCE number; transmitting to the UE a configuration for one or more CSSs configured on the first cell and one or more PDCCH candidates in one or more USSs configured on the second cell, the configuration for a PDCCH including scheduling data for the first cell, the first cell including at least one of a PCell or a PSCell and the second cell including an SCell, and transmitting to the UE at least one PDCCH for a PDCCH including scheduling for the first cell based on the configuration and within a scheduled cell limit including a first total number of BDs and a second non-overlapping total number of CCEs for the PDCCH candidates in at least one of the one or more CSSs or one or more USSs configured on the first cell and the one or more USSs configured on the second cell.

The UE may receive, from the base station, a configuration for one or more PDCCH candidates in one or more CSSs configured on the first cell and in one or more USS configured on the second cell, the configuration for a PDCCH including scheduling data for the first cell; and performing blind decoding of the one or more PDCCH candidates in at least one of the one or more CSSs or the one or more USSs on the first cell and the one or more USSs on the second cell based on the configuration and within the scheduled cell limit comprising BD for PDCCH candidates and the total number of non-overlapping CCEs.

In some aspects, the UE may report to a base station a parameter indicating PDCCH blind decoding capability for CA supported by the UE; and the base station may set the scheduled cell limit to be less than or equal to the PDCCH blind decoding capability supported by the UE indicated by the parameter. In one aspect, the scheduled cell restriction may be based on a smaller SCS or the same SCS associated with the first cell or the second cell. In another aspect, the scheduled cell restriction has a value less than or equal to the CA restriction of the first cell and the second cell.

The UE may receive a PDCCH in one or more PDCCH candidates and, based on the PDCCH, receive a Physical Downlink Shared Channel (PDSCH) from or transmit a Physical Uplink Shared Channel (PUSCH) to a base station on a first cell. The UE may perform blind decoding of the one or more CSSs on the first cell and the one or more USSs on the first cell within the first threshold and the second threshold.

In some aspects, a first threshold indicating a first maximum number of BDs for CSSs on a first cell and a second threshold indicating a second maximum number of non-overlapping CCEs may be based on timeslots having a maximum number of BDs and non-overlapping CCEs for these CSSs, a third maximum number of BDs for USSs on a second cell may be based on a scheduled cell restriction minus the first threshold, and a fourth maximum number of non-overlapping CCEs for USSs on the second cell may be based on the scheduled cell restriction minus the second threshold.

In one aspect, the configuration may further include one or more PDCCH candidates in one or more USS configured on the first cell, and wherein the method further comprises receiving an indication of a first threshold indicating a first maximum number of BDs for the PDCCH candidates on the first cell and a second threshold indicating a second maximum number of non-overlapping CCEs from the base station. The base station may transmit the first threshold and the second threshold via RRC messages.

In a certain aspect, the third threshold for the third maximum BD number and the fourth threshold for the fourth maximum non-overlapping CCE number of CSSs on the first cell may be based on the time slot with the highest number of BDs and non-overlapping CCEs for these CSSs, and the first threshold may have a value greater than or equal to the third threshold, and the second threshold may have a value greater than or equal to the fourth threshold.

In one aspect, a base station may schedule at least one USS of a first USS configured on a first cell to exceed a first threshold or a second threshold of the first cell. The UE may determine that at least one of the first USS configured on the first cell is scheduled to exceed and be within the first and second thresholds of the first cell, and determine not to monitor PDCCH candidates for the at least one of the first USS scheduled to exceed the first or second thresholds.

In some aspect, the UE may transmit an indication of supporting one or more USSs on the first cell and the base station may receive the indication of supporting the one or more USSs on the first cell. The configuration for the one or more USSs on the first cell may be based on the UE supporting the one or more USSs on the first cell.

It is to be understood that the specific order or hierarchy of the various blocks in the disclosed process/flow diagrams is an illustration of an example approach. It will be appreciated that the specific order or hierarchy of blocks in the processes/flow diagrams may be rearranged based on design preferences. Further, some blocks may be combined or omitted. The accompanying method claims present elements of the various blocks in a sample order, and are not meant to be limited to the specific order or hierarchy presented.

The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown herein, but is to be accorded the full scope consistent with the language claims, wherein reference to an element in the singular is not intended to mean "one and only one" unless specifically so stated, but rather "one or more". Terms such as "if," "when … …," and "at … …" should be read to mean "under the conditions" rather than to imply a direct temporal relationship or reaction. That is, these phrases (e.g., "when … …") do not imply that an action will occur in response to or during the occurrence of an action, but rather merely that a condition is met, and do not require specific or immediate time constraints for the action to occur. The term "exemplary" is used herein to mean "serving as an example, instance, or illustration. Any aspect described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other aspects. The term "some" means one or more unless specifically stated otherwise. Combinations such as "at least one of A, B or C", "one or more of A, B or C", "at least one of A, B and C", "one or more of A, B and C", and "A, B, C or any combination thereof" include any combination of A, B and/or C, and may include a plurality of a, a plurality of B, or a plurality of C. In particular, combinations such as "at least one of A, B or C", "one or more of A, B or C", "at least one of A, B and C", "one or more of A, B and C", and "A, B, C or any combination thereof" may be a alone, B alone, C, A and B, A and C, B and C, or a and B and C, wherein any such combination may comprise one or more members of A, B or C. The elements of the various aspects described throughout this disclosure are all structural and functional equivalents that are presently or later to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Furthermore, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. The terms "module," mechanism, "" element, "" device, "and the like may not be a substitute for the term" means. As such, no element of a claim should be construed as a means-plus-function unless the element is explicitly recited using the phrase "means for … …".

The following aspects are merely illustrative and may be combined with other aspects or teachings described herein without limitation.

Aspect 1 is a wireless communication method at a UE, the method comprising: the method includes receiving a configuration for one or more PDCCH candidates from a base station in at least one of one or more CSSs and one or more USSs configured on a first cell, or one or more CSSs configured on a first cell, and one or more USSs configured on a second cell, the configuration for a PDCCH including scheduling data for the first cell, the first cell including at least one of a PCell or a PSCell, and the second cell including an SCell, and performing a blind decoding of the one or more PDCCH candidates in the one or more USSs on the first cell and the one or more USSs on the second cell based on the configuration and within a scheduled cell restriction including a first total number of BDs and a second total number of non-overlapping CCEs for the PDCCH candidates.

Aspect 2 is the method of aspect 1, wherein the scheduled cell restriction is based on a smaller SCS or the same SCS associated with the first cell or the second cell.

Aspect 3 is the method of any one of aspects 1 and 2, further comprising reporting to the base station a parameter indicating PDCCH blind decoding capability for CA supported by the UE, wherein the scheduled cell limit is set to be less than or equal to the PDCCH blind decoding capability supported by the UE indicated by the parameter.

Aspect 4 is the method of any one of aspects 1 to 3, wherein the scheduled cell restriction has a value less than or equal to a CA restriction of the first cell and the second cell.

Aspect 5 is the method of any one of aspects 1 to 4, further comprising: the method includes receiving a PDCCH in one or more PDCCH candidates and receiving a PDSCH from or transmitting a PUSCH to a base station on a first cell based on the PDCCH.

Aspect 6 is the method of any one of aspects 1 to 5, wherein a first threshold indicating a first maximum BD number for CSSs on the first cell and a second threshold indicating a second maximum non-overlapping CCE number for the CSSs are based on timeslots having a highest number of BDs and non-overlapping CCEs for the CSSs, a third maximum BD number for USSs on the second cell is based on a scheduled cell restriction on BDs minus the first threshold, and a fourth maximum non-overlapping CCE number for the USSs on the second cell is based on a scheduled cell restriction on non-overlapping CCEs minus the second threshold.

Aspect 7 is the method of any one of aspects 1 to 6, wherein the configuring further comprises one or more PDCCH candidates in one or more USSs configured on the first cell, and wherein the method further comprises receiving an indication of a first threshold indicating a first maximum number of BDs for PDCCH candidates on the first cell and a second threshold indicating a second maximum number of non-overlapping CCEs for the PDCCH candidates from the base station.

Aspect 8 is the method of aspect 7, wherein the first threshold and the second threshold are received via an RRC message.

Aspect 9 is the method of any one of aspects 7 and 8, further comprising performing blind decoding of the one or more CSSs on the first cell and the one or more USSs on the first cell within a first threshold and a second threshold.

Aspect 10 is the method of aspect 9, wherein the third threshold for the third maximum BD number and the fourth threshold for the fourth maximum non-overlapping CCE number of CSSs on the first cell are based on timeslots having the maximum number of BDs and non-overlapping CCEs for these CSSs, and the first threshold has a value greater than or equal to the third threshold and the second threshold has a value greater than or equal to the fourth threshold.

Aspect 11 is the method of any one of aspects 7 to 10, further comprising: the method includes determining that at least one of the first USSs configured on the first cell is scheduled to exceed a first threshold or a second threshold of the first cell, and determining not to monitor PDCCH candidates for the at least one of the first USSs scheduled to exceed the first threshold and the second threshold.

Aspect 12 is the method of any one of aspects 7 to 11, further comprising: transmitting an indication of support of one or more USSs on the first cell, wherein the configuration for the one or more USSs on the first cell is based on the UE supporting the one or more USSs on the first cell.

Aspect 13 is an apparatus for wireless communication, comprising: at least one processor coupled to the memory and configured to implement the method of any one of aspects 1 to 12, further comprising a transceiver coupled to the at least one processor.

Aspect 14 is an apparatus for wireless communication comprising means for implementing the method of any one of aspects 1 to 12.

Aspect 15 is a computer-readable medium storing computer-executable code, wherein the code, when executed by a processor, causes the processor to implement the method of any one of aspects 1 to 12.

Aspect 16 is a method of wireless communication at a network node, the method comprising: configuring a first threshold indicating a first maximum BD for PDCCH candidates on a first cell and a second threshold indicating a second maximum non-overlapping CCE number for these PDCCH candidates; outputting, to the UE, a configuration for the one or more PDCCH candidates for the PDCCH including scheduling data for the first cell in at least one of the one or more CSSs and the one or more USSs configured on the first cell, or the one or more CSSs configured on the first cell, and the one or more USSs configured on the second cell, the configuration for the PDCCH including scheduling data for the first cell, the first cell including at least one of the PCell or the PSCell, and the second cell including the SCell, and outputting, to the UE, the at least one PDCCH candidate for the PDCCH including the scheduling data for the first cell based on the configuration and within a scheduled cell restriction including a first total number of BDs for the PDCCH candidates and a second non-overlapping total number of CCEs, the one or more PDCCHs configured on the first cell, and the one or more PDCCH candidates configured on the second cell.

Aspect 17 is the method of aspect 16, wherein the scheduled cell limit comprising the first BD total number and the second non-overlapping CCE total number for the PDCCH candidate is based on a smaller SCS or the same SCS associated with the first cell or the second cell.

Aspect 18 is the method of any one of aspects 16 and 17, wherein the scheduled cell restriction has a value less than or equal to a CA restriction of the first cell and the second cell.

Aspect 19 is the method of any one of aspects 16 to 18, further comprising: a parameter indicating PDCCH blind decoding capability for CA supported by a UE is received from the UE, wherein a scheduled cell restriction is set to be less than or equal to the PDCCH blind decoding capability supported by the UE indicated by the parameter.

Aspect 20 is the method of any one of aspects 16 to 19, further comprising: the PDSCH is output on the first cell for transmission or PUSCH reception from the UE based on the PDSCH.

Aspect 21 is the method of any one of aspects 16 to 20, wherein a first threshold indicating a first maximum BD number for CSSs on the first cell and a second threshold indicating a second maximum non-overlapping CCE number for the CSSs are based on timeslots having a highest number of BDs and non-overlapping CCEs for the CSSs, a third maximum BD number for USSs on the second cell is based on a scheduled cell restriction on BDs minus the first threshold, and a fourth maximum non-overlapping CCE number for the USSs on the second cell is based on a scheduled cell restriction on non-overlapping CCEs minus the second threshold.

Aspect 22 is the method of any one of aspects 16 to 21, wherein the configuration further comprises one or more PDCCH candidates in one or more USS on the first cell, and wherein the method further comprises outputting for transmission an indication of a first threshold indicating a first maximum number of BDs for the PDCCH candidates on the first cell and a second threshold indicating a second maximum number of non-overlapping CCEs for the PDCCH candidates.

Aspect 23 is the method of aspect 22, wherein the first threshold is transmitted via an RRC message.

Aspect 24 is the method of any one of aspects 22 and 23, wherein the third threshold for the third maximum BD number and the fourth threshold for the fourth maximum non-overlapping CCE number of CSSs on the first cell are based on timeslots having the maximum number of BDs and non-overlapping CCEs for these CSSs, and the first threshold has a value greater than or equal to the third threshold and the second threshold has a value greater than or equal to the fourth threshold.

Aspect 25 is the method of aspect 22, wherein at least one of the first USS configured on the first cell is scheduled to exceed a first threshold or a second threshold of the first cell.

Aspect 26 is the method of any one of aspects 22 to 25, further comprising: an indication is received of support of one or more USSs on the first cell, wherein the configuration for the one or more USSs on the first cell is based on the UE supporting the one or more USSs on the first cell.

Aspect 27 is an apparatus for wireless communication, comprising: at least one processor coupled to the memory and configured to implement the method of any one of aspects 16 to 26, further comprising a transceiver coupled to the at least one processor.

Aspect 28 is an apparatus for wireless communication, comprising means for implementing the method of any one of aspects 16 to 26.

Aspect 29 is a computer-readable medium storing computer-executable code, wherein the code, when executed by a processor, causes the processor to implement the method of any one of aspects 16 to 26.

Claims (30)

1. An apparatus for wireless communication at a User Equipment (UE), comprising:

a memory; and

at least one processor coupled to the memory and configured to:

receiving, from a base station, a configuration for one or more Physical Downlink Control Channel (PDCCH) candidates among:

at least one of one or more Common Search Spaces (CSSs) and one or more user-specific search spaces (USSs) configured on the first cell, or

One or more CSSs configured on the first cell, and

One or more USS configured on a second cell, the configuration being for a PDCCH comprising scheduling data for the first cell, the first cell comprising at least one of a primary cell (PCell) or a primary secondary cell (PSCell), and the second cell comprising a secondary cell (SCell); and

based on the configuration and within a scheduled cell limit comprising a first total number of Blind Decodes (BDs) and a second total number of non-overlapping Control Channel Elements (CCEs) for PDCCH candidates, blind decoding of the one or more PDCCH candidates is performed in the one or more USSs on the first cell and the one or more USSs on the second cell.

2. The apparatus of claim 1, further comprising: a transceiver coupled to the at least one processor, wherein the scheduled cell restriction is based on a smaller subcarrier spacing (SCS) or the same SCS associated with the first cell or the second cell.

3. The apparatus of claim 1, wherein the at least one processor is further configured to: reporting to the base station a parameter indicating PDCCH blind decoding capability for Carrier Aggregation (CA) supported by the UE,

Wherein the scheduled cell limit is set to be less than or equal to the PDCCH blind decoding capability supported by the UE indicated by the parameter.

4. The apparatus of claim 1, wherein the scheduled cell restriction has a value less than or equal to a CA restriction of the first cell and the second cell.

5. The apparatus of claim 1, wherein the at least one processor is further configured to:

receiving the PDCCH in one or more PDCCH candidates among PDCCH candidates; and

a Physical Downlink Shared Channel (PDSCH) is received from or transmitted to the base station on the first cell based on the PDCCH.

6. The apparatus of claim 1, wherein a first threshold indicating a first maximum BD number for CSS on the first cell and a second threshold indicating a second maximum non-overlapping CCE number for the CSS are based on time slots having a highest number of BDs and non-overlapping CCEs for the CSS, and

wherein a third maximum BD number for USSs on the second cell is based on the scheduled cell limit for BD minus the first threshold and a fourth maximum non-overlapping CCE number for the USSs on the second cell is based on the scheduled cell limit for non-overlapping CCEs minus the second threshold.

7. The apparatus of claim 1, wherein the configuration further comprises the one or more PDCCH candidates in the one or more USS configured on the first cell, and

wherein the at least one processor is further configured to receive, from the base station, an indication of a first threshold indicating a first maximum number of BDs for PDCCH candidates on the first cell and a second threshold indicating a second maximum number of non-overlapping CCEs for the PDCCH candidates.

8. The apparatus of claim 7, wherein at least one of the first threshold or the second threshold is received via a Radio Resource Control (RRC) message.

9. The apparatus of claim 7, wherein the at least one processor is further configured to: performing blind decoding of the one or more CSSs on the first cell and the one or more USSs on the first cell within the first threshold and the second threshold.

10. The apparatus of claim 9, wherein a third threshold for a third maximum BD number of CSSs on the first cell and a fourth threshold for a fourth maximum non-overlapping CCE number of the CSSs are based on time slots having a highest number of BDs and non-overlapping CCEs for the CSSs, and the first threshold has a first value greater than or equal to the third threshold and the second threshold has a second value greater than or equal to the fourth threshold.

11. The apparatus of claim 7, wherein the at least one processor is further configured to:

determining that at least one USS of a first USS configured on the first cell is scheduled to exceed the first threshold or the second threshold of the first cell; and

it is determined not to monitor PDCCH candidates for the at least one USS of the first USS that is scheduled to exceed the first threshold or the second threshold.

12. The apparatus of claim 7, wherein the at least one processor is further configured to: indicating support of the one or more USSs on the first cell, wherein the configuration for the one or more USSs on the first cell is based on the UE supporting the one or more USSs on the first cell.

13. An apparatus for wireless communication at a network node, comprising:

a memory; and

at least one processor coupled to the memory and configured to:

configuring a first threshold indicating a first maximum number of Blind Decodes (BD) for a Physical Downlink Control Channel (PDCCH) candidate on a first cell and a second threshold indicating a second maximum number of non-overlapping Control Channel Elements (CCEs) for the PDCCH candidate;

Outputting, to a User Equipment (UE), a configuration for transmission of one or more PDCCH candidates for at least one of one or more Common Search Spaces (CSSs) and one or more user-specific search spaces (USSs) configured on the first cell, or one or more CSSs configured on the first cell, and one or more USSs configured on a second cell, the configuration for a PDCCH comprising scheduling data for the first cell, the first cell comprising at least one of a primary cell (PCell) or a primary secondary cell (PSCell), and the second cell comprising a secondary cell (SCell); and

at least one PDCCH is output to the UE for transmission for a PDCCH including scheduling for the first cell based on the configuration and within a scheduled cell limit including a total number of BDs and non-overlapping CCEs for PDCCH candidates, the at least one of the one or more CSSs or the one or more USSs configured on the first cell and the one or more PDCCH candidates configured on the second cell.

14. The apparatus of claim 13, further comprising: a transceiver coupled to the at least one processor, wherein the scheduled cell restriction including the total number of BD and non-overlapping CCEs for PDCCH candidates is based on a smaller subcarrier spacing (SCS) or the same SCS associated with the first cell or the second cell.

15. The apparatus of claim 13, wherein the scheduled cell restriction has a value less than or equal to a CA restriction of the first cell and the second cell.

16. The apparatus of claim 13, wherein the at least one processor is further configured to: a parameter indicating PDCCH blind decoding capability for Carrier Aggregation (CA) supported by the UE is received from the UE,

wherein the scheduled cell limit is set to be less than or equal to the PDCCH blind decoding capability supported by the UE indicated by the parameter.

17. The apparatus of claim 13, wherein the at least one processor is further configured to: a Physical Downlink Shared Channel (PDSCH) is output on the first cell for transmission or reception of a Physical Uplink Shared Channel (PUSCH) from the UE based on the PDCCH.

18. The apparatus of claim 13, wherein the first threshold indicating a first maximum BD number and a second maximum non-overlapping CCE number for CSS on the first cell is based on time slots having a highest number of BDs and non-overlapping CCEs for the CSS, and a third maximum BD number for USSs on the second cell is based on the scheduled cell limit for BDs minus the first threshold, and a fourth maximum non-overlapping CCE number for the USSs on the second cell is based on the scheduled cell limit for non-overlapping CCEs minus the second threshold.

19. The apparatus of claim 13, wherein the configuration further comprises the one or more PDCCH candidates in the one or more USS on the first cell, and the at least one processor is further configured to: an indication of the first threshold indicating a first maximum number of BDs for the PDCCH candidate on the first cell and the second threshold indicating a second maximum number of non-overlapping CCEs for the PDCCH candidate is output for transmission.

20. The apparatus of claim 19, wherein at least one of the first threshold or the second threshold is transmitted via a Radio Resource Control (RRC) message.

21. The apparatus of claim 19, wherein a third threshold for a third maximum BD number and a fourth threshold for a fourth maximum non-overlapping CCE number for CSS on the first cell are based on time slots having a highest number of BDs and non-overlapping CCEs for the CSS, and the first threshold has a first value greater than or equal to the third threshold and the second threshold has a second value greater than or equal to the fourth threshold.

22. The apparatus of claim 19, wherein at least one of the first USS configured on the first cell is scheduled to exceed the first threshold or the second threshold of the first cell.

23. The apparatus of claim 19, wherein the at least one processor is further configured to: receiving an indication of support of the one or more USSs on the first cell, wherein configuration for the one or more USSs on the first cell is based on the UE supporting the one or more USSs on the first cell.

24. A method of wireless communication at a User Equipment (UE), comprising:

receiving, from a base station, a configuration for one or more Physical Downlink Control Channel (PDCCH) candidates configured on a first cell comprising at least one of a primary cell (PCell) or a primary secondary cell (PSCell) and one or more Common Search Spaces (CSSs) configured on the first cell or one or more CSSs configured on a second cell comprising at least one of a primary cell (PCell) or a secondary cell (SCell) and one or more USSs configured on the second cell, the configuration for a PDCCH comprising scheduling data for the first cell; and

Based on the configuration and within a scheduled cell limit comprising a first total number of Blind Decodes (BDs) and a second total number of non-overlapping Control Channel Elements (CCEs) for PDCCH candidates, blind decoding of the one or more PDCCH candidates is performed in the one or more USSs on the first cell and the one or more USSs on the second cell.

25. The method of claim 24, wherein the configuring further comprises configuring the one or more PDCCH candidates in one or more USS on the first cell, and

wherein the method further comprises: an indication of a first threshold indicating a first maximum number of BDs for PDCCH candidates on the first cell and a second threshold indicating a second maximum number of non-overlapping CCEs for the PDCCH candidates is received from the base station.

26. The method of claim 25, further comprising:

performing blind decoding of the one or more CSSs on the first cell and the one or more USSs on the first cell within the first threshold and the second threshold,

Wherein a third threshold for a third maximum BD number and a fourth threshold for a fourth maximum non-overlapping CCE number of CSSs on the first cell are based on time slots having a highest number of BD and non-overlapping CCEs for the CSSs, and the first threshold has a first value greater than or equal to the third threshold and the second threshold has a second value greater than or equal to the fourth threshold.

27. The method of claim 25, further comprising:

determining that at least one USS of a first USS configured on the first cell is scheduled to exceed the first threshold or the second threshold of the first cell; and

it is determined not to monitor PDCCH candidates for the at least one USS of the first USS that is scheduled to exceed the first threshold or the second threshold.

28. A method of wireless communication at a network node, comprising:

configuring a first threshold indicating a first maximum number of Blind Decodes (BD) for a Physical Downlink Control Channel (PDCCH) candidate on a first cell and a second threshold indicating a second maximum number of non-overlapping Control Channel Elements (CCEs) for the PDCCH candidate;

Outputting, to a User Equipment (UE), a configuration for transmission of one or more PDCCH candidates for at least one of one or more Common Search Spaces (CSSs) and one or more user-specific search spaces (USSs) configured on the first cell, or one or more CSSs configured on the first cell, and one or more USSs configured on a second cell, the configuration for a PDCCH comprising scheduling data for the first cell, the first cell comprising at least one of a primary cell (PCell) or a primary secondary cell (PSCell), and the second cell comprising a secondary cell (SCell); and

at least one PDCCH is output to the UE for transmission for a PDCCH including scheduling for the first cell based on the configuration and within a scheduled cell limit including a total number of BDs and non-overlapping CCEs for PDCCH candidates, the at least one of the one or more CSSs or the one or more USSs configured on the first cell and the one or more PDCCH candidates configured on the second cell.

29. The method of claim 28, wherein the scheduled cell restriction comprising a total number of BDs and non-overlapping CCEs for PDCCH candidates is based on a smaller subcarrier spacing (SCS) or a same SCS associated with the first cell or the second cell.

30. The method of claim 28, wherein the configuration further comprises the one or more PDCCH candidates in the one or more USSs on the first cell, wherein the method further comprises outputting for transmission an indication of the first threshold indicating a first maximum number of BDs for PDCCH candidates on the first cell and the second threshold indicating a second maximum number of non-overlapping CCEs for the PDCCH candidates.