Cross-carrier scheduling technology for wireless communication systems

Abstract

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may identify that the UE is communicating with a primary cell and a secondary cell in a carrier aggregation configuration, wherein the primary cell is a cell scheduled across carriers and the secondary cell is a cross-carrier scheduled cell. The UE may receive downlink control information from the secondary cell. The downlink control information may include a cross-carrier scheduling indication for scheduling data transmission with the primary cell. The UE may monitor a common search space of the primary cell for control information related to communication with the primary cell. The UE may communicate with the primary cell via data transmission based on at least one of the downlink control information from the secondary cell and the control information from the common search space of the primary cell.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This patent application claims the rights and interests in PCT application No. PCT / CN2020 / 074062, entitled “CROSS-CARRIERSCHEDULING TECHNIQUES FOR WIRELESS COMMUNICATIONS SYSTEMS,” filed by Takeda et al. on January 29, 2020, to be transferred to the present assignee. Technical Field

[0003] The following relates generally to wireless communications, and more particularly to cross-carrier scheduling techniques for wireless communication systems. Background Art

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcast, etc. These systems may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems, such as long term evolution (LTE) systems, LTE advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems (which may be referred to as new radio (NR) systems). These systems may employ techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each base station or network access node simultaneously supporting communication with multiple communication devices, which may be referred to as user equipment (UE).

[0005] In some examples, a UE may communicate with multiple serving cells of a wireless communication system in a carrier aggregation (CA) configuration. In some examples, a serving cell may send a cross-carrier scheduling indication that the UE will communicate with different serving cells via data transmission. For example, the UE may be scheduled to receive a downlink transmission or to send an uplink transmission. Summary of the Invention

[0006] The described techniques relate to improved methods, systems, devices, and apparatuses that support cross-carrier scheduling techniques for wireless communication systems. Generally, the described techniques provide one or more enhanced cross-carrier scheduling schemes. For example, the described techniques enable a UE to monitor the search space of a scheduled secondary cell (e.g., a user-specific search space associated with downlink control information (DCI) that schedules communications with another cell) in addition to the search space of a primary cell (e.g., a primary cell of a primary cell group, a primary and secondary cell of a secondary cell group, etc.) (e.g., a common search space of a primary cell associated with one or more mobility and connectivity functions). Such a cross-carrier scheduling scheme can enable efficient communication while implementing various functions associated with the primary cell. In some examples, the techniques described herein can also enable the UE to be configured with one or more parameters for monitoring various search spaces. For example, the UE can be configured with a user-specific search space of a scheduled secondary cell, and the UE can also be configured with a user-specific search space of a primary cell (e.g., the user-specific search space can correspond to the same search space identifier). The UE can determine an indication of the number of decoding candidates configured for the user-specific search space of the primary cell and utilize such parameters to identify one or more decoding candidate sets to be monitored on the secondary cell (e.g., based on the value of the carrier indicator field (CIF)). Additionally or alternatively, the UE may be configured to monitor the number of search spaces that meets (e.g., is less than or equal to) a threshold number of search spaces (e.g., a threshold based on UE capabilities or a pre-configured threshold). In some examples, the user-specific search space of the primary cell may be included in the number of search spaces. In some other examples, the user-specific search space of the primary cell may not be included in the number of search spaces.

[0007] A method for wireless communication at a UE is described. The method may include identifying that the UE is communicating with a primary cell and a secondary cell in a carrier aggregation configuration, wherein the primary cell is a cross-carrier scheduled cell and the secondary cell is a cross-carrier scheduled cell, receiving DCI from the secondary cell, wherein the DCI includes a cross-carrier scheduling indication related to scheduling of a data transmission in the primary cell, monitoring a common search space of the primary cell for control information related to communication with the primary cell as a cross-carrier scheduled cell, and communicating with the primary cell via a data transmission based on at least one of the DCI from the secondary cell and the control information from the common search space of the primary cell.

[0008] An apparatus for wireless communication at a UE is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to recognize that the UE is communicating with a primary cell and a secondary cell in a carrier aggregation configuration, wherein the primary cell is a cross-carrier scheduled cell and the secondary cell is a cross-carrier scheduled cell, receive DCI from the secondary cell, wherein the DCI includes a cross-carrier scheduling indication related to scheduling of data transmission by the primary cell, monitor a common search space of the primary cell for control information related to communication with the primary cell as a cross-carrier scheduled cell, and communicate with the primary cell via data transmission based on at least one of the DCI from the secondary cell and the control information from the common search space of the primary cell.

[0009] Another apparatus for wireless communication at a UE is described. The apparatus may include means for identifying that the UE is communicating with a primary cell and a secondary cell in a carrier aggregation configuration, wherein the primary cell is a cross-carrier scheduled cell and the secondary cell is a cross-carrier scheduled cell, receiving DCI from the secondary cell, wherein the DCI includes a cross-carrier scheduling indication related to scheduling of data transmission by the primary cell, monitoring a common search space of the primary cell for control information related to communication with the primary cell as a cross-carrier scheduled cell, and communicating with the primary cell via a data transmission based on at least one of the DCI from the secondary cell and the control information from the common search space of the primary cell.

[0010] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to recognize that the UE is communicating with a primary cell and a secondary cell in a carrier aggregation configuration, wherein the primary cell is a cross-carrier scheduled cell and the secondary cell is a cross-carrier scheduled cell, receive data communication information (DCI) from the secondary cell, wherein the DCI includes a cross-carrier scheduling indication related to scheduling of data transmission by the primary cell, monitor a common search space (CS) of the primary cell for control information related to communication with the primary cell as a cross-carrier scheduled cell, and communicate with the primary cell via data transmission based on at least one of the DCI from the secondary cell and the control information from the CS of the primary cell.

[0011] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for identifying a search space identifier associated with a user-specific search space of a secondary cell, determining one or more configuration parameters associated with the user-specific search space of the primary cell based on the search space identifier, and monitoring a number of downlink control channel candidates for the user-specific search space of the secondary cell for DCI, wherein the number of downlink control channel candidates may be based on the one or more configuration parameters.

[0012] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the one or more configuration parameters include a per-aggregation level indication of a number of downlink control channel candidates to monitor.

[0013] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a search space identifier associated with a user-specific search space of a secondary cell is the same as a search space identifier that may be associated with a user-specific search space of a primary cell.

[0014] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for monitoring a first number of downlink control channel candidates in a secondary cell for information associated with the secondary cell, and monitoring a second number of downlink control channel candidates in the secondary cell for information associated with the primary cell.

[0015] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining a first number of downlink control channel candidates based on a CIF corresponding to a secondary cell, and determining a second number of downlink control channel candidates based on a CIF corresponding to a primary cell, wherein the DCI includes both the CIF corresponding to the secondary cell and the CIF corresponding to the primary cell.

[0016] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for identifying a number of search spaces that a UE monitors on a primary cell and a secondary cell, wherein the number of search spaces includes a common search space for the primary cell and a user-specific search space for the secondary cell, and determining whether the number of search spaces is less than or equal to a maximum number of search spaces that the UE can be configured to monitor per bandwidth portion.

[0017] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the number of search spaces includes a user-specific search space of a primary cell.

[0018] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the number of search spaces does not include a user-specific search space of a primary cell in the number of search spaces.

[0019] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for monitoring one or more downlink control channel candidates of a user-specific search space of a secondary cell for DCI.

[0020] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for identifying a cell radio network temporary identifier (C-RNTI), monitoring a common search space of a primary cell for control information using the C-RNTI, and monitoring a user-specific search space of a secondary cell using the C-RNTI, wherein receiving DCI from the secondary cell may be based on monitoring the user-specific search space of the secondary cell.

[0021] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, monitoring the common search space of a primary cell for control information related to communications with the primary cell may include operations, features, components, or instructions for monitoring a type 0 common search space of the primary cell, a type 0A common search space of the primary cell, a type 1 common search space of the primary cell, a type 2 common search space of the primary cell, a type 3 common search space of the primary cell, or any combination thereof.

[0022] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for performing one or more connectivity operations or mobility operations based on control information related to communication with a primary cell.

[0023] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, communicating with a primary cell via a data transmission may include operations, features, components, or instructions for receiving a downlink data transmission of the primary cell, sending an uplink data transmission of the primary cell, or both.

[0024] A method for wireless communication at a base station is described. The method may include identifying that a UE communicates with a primary cell and a secondary cell in a carrier aggregation configuration, wherein the primary cell is a cell scheduled across carriers and the secondary cell is a cross-carrier scheduled cell, transmitting control information related to communication with the primary cell in a common search space of the primary cell, transmitting DCI in a user-specific search space of the secondary cell, wherein the DCI includes a cross-carrier scheduling indication for scheduled data transmission with the primary cell, and communicating with the UE via data transmission in the primary cell based on at least one of the DCI and the control information related to communication with the primary cell.

[0025] An apparatus for wireless communication at a base station is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to recognize that a UE communicates with a primary cell and a secondary cell in a carrier aggregation configuration, wherein the primary cell is a cell scheduled across carriers and the secondary cell is a cross-carrier scheduled cell, transmit control information related to communication with the primary cell on a common search space of the primary cell, transmit DCI on a user-specific search space of the secondary cell, wherein the DCI includes a cross-carrier scheduling indication for scheduling data transmission with the primary cell, and communicate with the UE via data transmission of the primary cell based on at least one of the DCI and the control information related to communication with the primary cell.

[0026] Another apparatus for wireless communication at a base station is described. The apparatus may include means for identifying that a UE is communicating with a primary cell and a secondary cell in a carrier aggregation configuration, wherein the primary cell is a cell scheduled across carriers and the secondary cell is a cross-carrier scheduled cell, transmitting control information related to communication with the primary cell in a common search space of the primary cell, transmitting DCI in a user-specific search space of the secondary cell, wherein the DCI includes a cross-carrier scheduling indication for scheduling data transmission with the primary cell, and communicating with the UE via data transmission in the primary cell based on at least one of the DCI and the control information related to communication with the primary cell.

[0027] A non-transitory computer-readable medium storing code for wireless communication at a base station is described. The code may include instructions executable by a processor to identify that a UE is communicating with a primary cell and a secondary cell in a carrier aggregation configuration, wherein the primary cell is a cell scheduled across carriers and the secondary cell is a cross-carrier scheduled cell, transmit control information related to communication with the primary cell in a common search space of the primary cell, transmit data transmission information (DCI) in a user-specific search space of the secondary cell, wherein the DCI includes a cross-carrier scheduling indication that data transmission is scheduled in the primary cell, and communicate with the UE via data transmission in the primary cell based on at least one of the DCI and the control information related to communication with the primary cell.

[0028] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the common search space of the primary cell includes a type 0 common search space of the primary cell, a type 0A common search space of the primary cell, a type 1 common search space of the primary cell, a type 2 common search space of the primary cell, a type 3 common search space of the primary cell, or any combination thereof.

[0029] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for configuring a user-specific search space of a primary cell with a per-aggregation level indication of the number of downlink control channel candidates to monitor, and sending a CIF for the primary cell, a CIF for the secondary cell, or both to the UE.

[0030] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for configuring a UE with a search space identifier for a user-specific search space of a primary cell and a search space identifier for a user-specific search space of a secondary cell. In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the search space identifier for the user-specific search space of the primary cell may be the same as the search space identifier for the user-specific search space of the secondary cell.

[0031] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving an indication of a capability of the UE and configuring the UE to monitor a number of search spaces that meets a threshold number of search spaces for the UE to monitor in each bandwidth portion (e.g., a number of search spaces that is less than or equal to the threshold number of search spaces) based on the capability of the UE, where the number of search spaces includes a common search space for a primary cell and a user-specific search space for a secondary cell.

[0032] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the number of search spaces includes a user-specific search space of a primary cell.

[0033] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the number of search spaces does not include a user-specific search space of a primary cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 and Figure 2 An example of a wireless communication system supporting a cross-carrier scheduling technique for the wireless communication system according to aspects of the present disclosure is shown.

[0035] Figure 3 and Figure 4 An example of a scheduling scheme supporting a cross-carrier scheduling technique for a wireless communication system according to aspects of the present disclosure is shown.

[0036] Figure 5 An example of a process flow supporting a cross-carrier scheduling technique for a wireless communication system according to aspects of the present disclosure is shown.

[0037] Figure 6 and Figure 7A block diagram of a device supporting a cross-carrier scheduling technique for a wireless communication system according to aspects of the present disclosure is shown.

[0038] Figure 8 A block diagram of a communication manager supporting cross-carrier scheduling techniques for a wireless communication system according to aspects of the present disclosure is shown.

[0039] Figure 9 A diagram is shown of a system including devices supporting cross-carrier scheduling techniques for a wireless communication system according to aspects of the present disclosure.

[0040] Figure 10 and Figure 11 A block diagram of a device supporting a cross-carrier scheduling technique for a wireless communication system according to aspects of the present disclosure is shown.

[0041] Figure 12 A block diagram of a communication manager supporting cross-carrier scheduling techniques for a wireless communication system according to aspects of the present disclosure is shown.

[0042] Figure 13 A diagram is shown of a system including devices supporting cross-carrier scheduling techniques for a wireless communication system according to aspects of the present disclosure.

[0043] Figures 14 to 17 A flow chart illustrating a method of supporting cross-carrier scheduling techniques for a wireless communication system according to aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0044] A user equipment (UE) in a wireless communication system can communicate with multiple serving cells (e.g., associated with one or more base stations) in a carrier aggregation (CA) configuration to increase the available bandwidth and data rate of the UE. Each serving cell can communicate with the UE on its own component carrier (CC) in its own frequency band. Each serving cell can be associated with a radio access technology (RAT) (e.g., a fourth generation (4G) system such as a long term evolution (LTE) system, a fifth generation (5G) system which may be referred to as a new radio (NR) system, etc.). For example, a UE can communicate with two serving cells in a dual connectivity (DC) scheme (e.g., an NR-DC scheme, an evolved universal mobile telecommunications system terrestrial radio access (E-UTRA) NR(EN)-DC scheme, etc.), where each serving cell may belong to a different RAT or a different cell group within a RAT.

[0045] Each serving cell may belong to one or more cell groups, such as a master cell group (MCG), a secondary cell group (SCG), and the like. The UE may use radio resources associated with a master node (MN) to communicate with a serving cell in the MCG. Similarly, the UE may use radio resources associated with a secondary node (SN) to communicate with a serving cell in the SCG. The MCG may include a primary cell (PCell) and one or more secondary cells (SCells). Similarly, the SCG may include a primary secondary cell (PSCell) and one or more SCells. As used herein, PCell may refer to the PCell of the MCG or the PSCell of the SCG. The UE may establish a connection with the PCell of the MCG (or with the PSCell of the SCG), and then establish a connection with the SCell to increase the radio resources used to communicate with the cell group.

[0046] A cell may transmit control information in a control region such as a control resource set (CORESET) of the system bandwidth. For example, a CORESET may include one or more search spaces (e.g., a common search space (CSS) and / or a UE-specific search space (USS) for transmitting common and UE-specific control information, respectively. A UE may monitor decoding candidates of the CSS for control information intended for multiple UEs (e.g., physical downlink control channel (PDCCH) candidates) and monitor decoding candidates of the USS for control information specified for the UE.

[0047] In some examples, a UE may implement cross-carrier scheduling. For example, a UE may be configured to monitor PDCCH candidates in a search space on a PCell (e.g., a scheduling cell) for cross-carrier scheduling instructions associated with transmissions on an SCell (e.g., a scheduled cell) (e.g., a physical downlink shared channel (PDSCH) transmission, a physical uplink shared channel (PUSCH) transmission, etc.). However, conventional techniques for cross-carrier scheduling may have drawbacks that may result in reduced efficiency or reduced reliability of wireless communications at the UE.

[0048] According to the techniques described herein, a wireless communication system may implement one or more enhanced cross-carrier scheduling schemes. For example, a UE may be configured to monitor one or more search spaces of an SCell (e.g., a scheduling cell) for cross-carrier scheduling indications associated with transmissions on a PCell (e.g., a scheduled cell). As an illustrative example, the UE may monitor PDCCH candidates of a user-specific search space of the SCell for downlink control information (DCI) that schedules the UE for communication with the PCell (e.g., in addition to or as an alternative to communication with the SCell). To enable enhanced communication, the UE may also monitor one or more search spaces of the PCell for control information, which may enable the UE to implement one or more functions associated with the PCell (e.g., fallback operation, PDCCH ordering configuration, beam failure recovery operation, semi-persistent scheduling or configured grant scheduling activation or deactivation, and other examples of functions). For example, the UE may monitor one or more common search spaces of the PCell (e.g., type 0 common search space, type 0A common search space, type 1 common search space, type 2 common search space, type 3 common search space, or any combination thereof) to receive control information associated with one or more functions.

[0049] In some examples, the techniques described herein may further configure a UE with one or more parameters for a carrier aggregation configuration that supports cross-carrier scheduling from an SCell (e.g., a scheduling cell) to a PCell (e.g., a scheduled cell). For example, the UE may be configured with a user-specific search space for the SCell (e.g., to monitor PDCCH candidates for cross-carrier scheduling indications). The UE may determine a search space identifier for the user-specific search space of the PCell based on the configured user-specific search space of the SCell. For example, the UE may use the same search space identifier for both the SCell and the PCell. Additionally or alternatively, the UE may determine one or more parameters for the user-specific search space of the PCell (e.g., based on the determined or configured search space identifier). As an example, the UE may determine an indication of the number of decoding candidates configured for the user-specific search space of the PCell (e.g., an nrofCandidates parameter), a carrier indicator field (CIF) value corresponding to the PCell, and the like. The UE may utilize the one or more parameters to monitor the user-specific search space of the SCell, which may reduce signaling overhead for the PCell in a wireless communication system. For example, the UE may determine a first number of decoding candidates for the SCell based on the one or more parameters to monitor information associated with the SCell. The UE may also determine a second number of decoding candidates for the SCell based on the one or more parameters to monitor information associated with the PCell. Additionally or alternatively, the UE may be configured to monitor a number of search spaces for each bandwidth portion of each cell that is less than a threshold number of search spaces (e.g., a threshold based on UE capabilities or a pre-configured threshold). In some examples, a user-specific search space for the PCell (e.g., a "virtual" search space that the UE does not monitor) may be included in the number of search spaces. In some other examples, the user-specific search space for the PCell may not be included in the number of search spaces.

[0050] Aspects of the present disclosure are initially described in the context of wireless communication systems and are further illustrated and described with reference to scheduling schemes, process flows, apparatus diagrams, system diagrams, and flowcharts related to cross-carrier scheduling techniques for wireless communication systems.

[0051] Figure 1An example of a wireless communication system 100 supporting cross-carrier scheduling techniques for a wireless communication system according to aspects of the present disclosure is shown. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a Long Term Evolution (LTE) network, an LTE Advanced (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communication, ultra-reliable (e.g., mission-critical) communication, low-latency communication, communication with low-cost and low-complexity devices, or any combination thereof.

[0052] Base stations 105 may be dispersed throughout a geographic area to form wireless communication system 100 and may be devices of varying forms or capabilities. Base stations 105 and UEs 115 may communicate wirelessly via one or more communication links 125. Each base station 105 may provide a coverage area 110 over which UEs 115 and base stations 105 may establish one or more communication links 125. Coverage area 110 may be an example of a geographic area over which base stations 105 and UEs 115 may support signal communication according to one or more radio access technologies.

[0053] UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary or mobile, or both, at different times. The UEs 115 may be devices of different forms or with different capabilities. Figure 1 Some example UEs 115 are shown in FIG. Figure 1 As shown, the UE 115 described herein may be capable of communicating with various types of devices, such as other UEs 115, base stations 105, or network devices (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network devices).

[0054] The base stations 105 can communicate with the core network 130 or with each other, or both. For example, the base stations 105 can interface with the core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). The base stations 105 can communicate with each other directly (e.g., directly between the base stations 105) or indirectly (e.g., via the core network 130), or both, via the backhaul links 120 (e.g., via X2, Xn, or other interfaces). In some examples, the backhaul links 120 can be or include one or more wireless links.

[0055] The one or more base stations 105 described herein may include or may be referred to by one of ordinary skill in the art as a base transceiver, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB), a next generation NodeB or a giga-NodeB (any of which may be referred to as a gNB), a Home NodeB, a Home eNodeB, or other suitable terminology.

[0056] UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where in other examples, a "device" may also be referred to as a unit, a station, a terminal, or a client. UE 115 may also include or may be referred to as a personal electronic device such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communication (MTC) device, etc., which may be implemented in various objects such as home appliances, vehicles, meters, etc.

[0057] like Figure 1 As shown, the UE 115 described herein can communicate with various types of devices, such as other UEs 115, which can sometimes act as relays, as well as base stations 105 and network devices including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, etc.

[0058] The UE 115 and the base station 105 may wirelessly communicate with each other via one or more communication links 125 over one or more carriers. The term "carrier" may refer to a collection of radio frequency spectrum resources having a defined physical layer structure for supporting the communication link 125. For example, a carrier used for the communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth part (BWP)) operating according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling for coordinating carrier operation, user data, or other signaling. The wireless communication system 100 may support communication with the UE 115 using carrier aggregation or multi-carrier operation. The UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0059] In some examples (e.g., in a carrier aggregation configuration), a carrier may also have acquisition signaling or control signaling that coordinates the operation of other carriers. A carrier may be associated with a frequency channel (e.g., an E-UTRA Absolute Radio Frequency Channel Number (EARFCN)) and may be located according to a channel raster used for discovery by a UE 115. A carrier may operate in a standalone mode, where initial acquisition and connection may be performed by a UE 115 via the carrier, or in a non-standalone mode, where the connection is anchored using a different carrier (e.g., of the same or different radio access technology).

[0060] The communication link 125 shown in the wireless communication system 100 may include an uplink transmission from the UE 115 to the base station 105, or a downlink transmission from the base station 105 to the UE 115. A carrier may carry downlink or uplink communications (e.g., in FDD mode) or may be configured to carry both downlink and uplink communications (e.g., in TDD mode).

[0061] A carrier can be associated with a particular bandwidth of radio frequency spectrum, and in some examples, the carrier bandwidth can be referred to as the "system bandwidth" of the carrier or wireless communication system 100. For example, the carrier bandwidth can be one of several determined bandwidths of a carrier for a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz)). The devices of the wireless communication system 100 (e.g., base station 105, UE 115, or both) can have a hardware configuration that supports communication on a particular carrier bandwidth or can be configured to support communication on one of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 or UE 115 that supports simultaneous communication via carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 can be configured to operate on a portion (e.g., a sub-band, BWP) or the entire carrier bandwidth.

[0062] The signal waveform transmitted via the carrier may be composed of multiple subcarriers (e.g., using a multicarrier modulation (MCM) technique such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system employing MCM techniques, a resource element may comprise a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period and subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the codec rate of the modulation scheme, or both). Therefore, the more resource elements a UE 115 receives and the higher the order of the modulation scheme, the higher the data rate may be for the UE 115. Wireless communication resources may refer to a combination of radio spectrum resources, time resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers may further increase the data rate or data integrity used for communications with the UE 115.

[0063] One or more parameter sets for a carrier may be supported, where the parameter set may include subcarrier spacing (Δf) and a cyclic prefix. A carrier may be divided into one or more BWPs with the same or different parameter sets. In some examples, a UE 115 may be configured with multiple BWPs. In some examples, a single BWP for a carrier may be active at a given time, and communications for the UE 115 may be limited to the one or more active BWPs.

[0064] The time interval of the base station 105 or the UE 115 can be expressed as a multiple of a basic time unit. For example, the basic time unit can be referred to as T s =1 / (Δf max ·N f ) seconds of sampling period, where Δf max It can represent the maximum supported subcarrier spacing, and N f The maximum supported discrete Fourier transform (DFT) size may be indicated. Time intervals for communication resources may be organized according to radio frames, each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023).

[0065] Each frame may include a plurality of consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, the frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into a plurality of time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include a plurality of symbol periods (e.g., depending on the length of the cyclic prefix preceding each symbol period). In some wireless communication systems, the time slot may be further divided into a plurality of mini-slots containing one or more symbols. In addition to the cyclic prefix, each symbol period may contain one or more (e.g., N) subframes. f ) sampling period. The duration of a symbol period may depend on the subcarrier spacing or frequency band of operation.

[0066] A subframe, slot, mini-slot, or symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs)).

[0067] Physical channels can be multiplexed on a carrier according to various techniques. Physical control channels and physical data channels can be multiplexed on a downlink carrier, for example, using one or more of time division multiplexing (TDM), frequency division multiplexing (FDM), or hybrid TDM-FDM techniques. A control region (e.g., a control resource set (core set)) of a physical control channel can be defined by multiple symbol periods and can extend across the system bandwidth of a carrier or a subset of the system bandwidth. One or more control regions (e.g., core sets) can be configured for a set of UEs 115. For example, one or more of UEs 115 can monitor or search the control region for control information according to one or more search space sets, and each search space set can include one or more control channel candidates in one or more aggregation levels arranged in a cascaded manner. An aggregation level of a control channel candidate can refer to multiple control channel resources (e.g., control channel elements (CCEs)) associated with coded information of a control information format having a given payload size. A search space set can include a common search space set configured for transmitting control information to multiple UEs 115 and a UE-specific search space set for transmitting control information to a specific UE 115.

[0068] Each base station 105 may provide communication coverage via one or more cells (e.g., macro cells, small cells, hot spots, or other types of cells, or any combination thereof). The term "cell" may refer to a logical communication entity used to communicate with the base station 105 (e.g., via a carrier) and may be associated with an identifier (e.g., a physical cell identifier (PCID), a virtual cell identifier (VCID), or other) used to distinguish between adjacent cells. In some examples, a cell may also refer to a geographic coverage area 110 or a portion of a geographic coverage area 110 (e.g., a sector) on which the logical communication entity operates. Depending on various factors such as the capabilities of the base station 105, these cells may range from smaller areas (e.g., structures, subsets of structures) to larger areas. For example, a cell may be or include a building, a subset of buildings, or an external space between or overlapping geographic coverage areas 110, etc.

[0069] A macro cell typically covers a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access by a UE 115 through a service subscription with a network provider that supports the macro cell. A small cell may be associated with a base station with lower power than a macro cell, and the small cell may operate in the same or different (e.g., licensed, unlicensed) frequency band as the macro cell. A small cell may provide unrestricted access to a UE 115 through a service subscription with a network provider, or may provide restricted access to a UE 115 associated with the small cell (e.g., a UE 115 in a closed subscriber group (CSG), a UE 115 associated with a user in a home or office). A base station 105 may support one or more cells and may also support communication on one or more cells using one or more component carriers.

[0070] In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., MTC, narrowband IoT (NB-IoT), enhanced mobile broadband (eMBB)) that may provide access to different types of devices.

[0071] In some examples, base stations 105 can be mobile, and thus provide communication coverage for mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies can overlap, but the different geographic coverage areas 110 can be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies can be supported by different base stations 105. The wireless communication system 100 can include, for example, a heterogeneous network in which different types of base stations 105 provide coverage for various geographic coverage areas 110 using the same or different radio access technologies.

[0072] The wireless communication system 100 can be configured to support ultra-reliable communication or low-latency communication, or various combinations thereof. For example, the wireless communication system 100 can be configured to support ultra-reliable low-latency communication (URLLC) or mission-critical communication. UE 115 can be designed to support ultra-reliable, low-latency or critical functions (e.g., mission-critical functions). Ultra-reliable communication may include private communication or group communication and may be supported by one or more mission-critical services such as mission-critical push-to-talk (MCPTT), mission-critical video (MCVideo), or mission-critical data (MCData). Support for mission-critical functions may include service prioritization, and mission-critical services can be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, mission-critical, and ultra-reliable low-latency may be used interchangeably herein.

[0073] In some examples, UE 115 can also communicate directly with other UEs 115 via device-to-device (D2D) communication links 135 (e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UEs 115 utilizing D2D communication can be within the geographic coverage area 110 of base station 105. Other UEs 115 in such a group can be outside the geographic coverage area 110 of base station 105 or unable to receive transmissions from base station 105. In some examples, a group of UEs 115 communicating via D2D communication can utilize a one-to-many (1:M) system in which each UE 115 transmits to each other UE 115 in the group. In some examples, base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between UEs 115 without involving base station 105.

[0074] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or a 5G core (5GC), which may include at least one control plane entity (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) that manages access and mobility and at least one user plane entity (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), a user plane function (UPF)) that routes packets or interconnections to external networks. The control plane entities may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management, for UEs 115 served by base stations 105 associated with the core network 130. User IP packets may be transmitted via the user plane entities, which may provide IP address allocation and other functions. The user plane entities may be connected to the network operator IP services 150. The operator IP services 150 may include access to the Internet, an intranet, an IP multimedia subsystem (IMS), or packet-switched streaming services.

[0075] Some network devices, such as base stations 105, may include subcomponents such as access network entities 140, which may be examples of access node controllers (ANCs). Each access network entity 140 may communicate with a UE 115 through one or more other access network transport entities 145, which may be referred to as radio heads, smart radio heads, or transmit / receive points (TRPs). Each access network transport entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio heads and ANCs) or consolidated into a single network device (e.g., base station 105).

[0076] The wireless communication system 100 can operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). The 300 MHz to 3 GHz region is often referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately 1 decimeter to 1 meter long. UHF waves can be blocked or redirected by buildings and environmental features, but these waves can penetrate structures sufficiently for a macrocell to provide service to a UE 115 located indoors. Transmissions using UHF waves can be associated with smaller antennas and a shorter range (e.g., less than 100 kilometers) than transmissions using the lower frequencies and longer wavelengths of the high frequency (HF) or very high frequency (VHF) portions of the spectrum with frequencies less than 300 MHz.

[0077] The wireless communication system 100 may also operate in the super high frequency (SHF) region (also known as the centimeter band) using frequency bands from 3 GHz to 30 GHz or in the extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz, also known as the millimeter band). In some examples, the wireless communication system 100 may support millimeter wave (mmW) communications between the UE 115 and the base station 105, and the EHF antennas of each device may be smaller and more closely spaced than the UHF antennas. In some examples, this may facilitate the use of antenna arrays within the device. However, the propagation of EHF transmissions may be subject to greater atmospheric attenuation and a shorter range than SHF or UHF transmissions. The techniques disclosed herein may be employed across transmissions using one or more different frequency regions, and the designated use of frequency bands across these frequency regions may vary by country or regulatory body.

[0078] The wireless communication system 100 can utilize licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 can employ license assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band. When operating in an unlicensed radio spectrum band, devices such as the base station 105 and the UE 115 can employ carrier sensing for collision detection and avoidance. In some examples, operations in the unlicensed band can be based on carrier aggregation configuration and component carriers operating in a licensed band (e.g., LAA). Operations in the unlicensed spectrum can include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, etc.

[0079] The base station 105 or UE 115 may be equipped with multiple antennas that can be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of the base station 105 or UE 115 may be located within one or more antenna arrays or antenna panels that can support MIMO operations, or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located on an antenna assembly (e.g., an antenna tower). In some examples, the antennas or antenna arrays associated with the base station 105 may be located at different geographical locations. The base station 105 may have an antenna array with several rows and columns of antenna ports that the base station 105 may use to support beamforming for communications with the UE 115. Similarly, the UE 115 may have one or more antenna arrays that can support various MIMO or beamforming operations. Additionally or alternatively, the antenna panels may support radio frequency beamforming for signals transmitted via the antenna ports.

[0080] Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., base station 105, UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals transmitted via antenna elements of an antenna array such that some signals propagating in a particular direction relative to the antenna array experience constructive interference while other signals experience destructive interference. Adjustments to signals transmitted via antenna elements may include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to signals carried via antenna elements associated with the device. The adjustments associated with each antenna element may be defined by a set of beamforming weights associated with a particular direction (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other direction).

[0081] The wireless communication system 100 can be a packet-based network operating according to a layered protocol stack. In the user plane, the communication at the bearer or packet data convergence protocol (PDCP) layer can be IP-based. The radio link control (RLC) layer can perform packet segmentation and reassembly to communicate on the logical channel. The medium access control (MAC) layer can perform priority processing and multiplex the logical channel into the transport channel. The MAC layer can also use error detection technology, error correction technology, or both to support retransmission of the MAC layer to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer can provide the establishment, configuration, and maintenance of the RRC connection between the UE 115 and the base station 105 or the core network 130 supporting the radio bearer for user plane data. At the physical layer, the transport channel can be mapped to the physical channel.

[0082] In some examples, base station 105 may include one or more wireless nodes. For example, base station 105 may include wireless nodes for a PCell, wireless nodes for an SCell, wireless nodes from a PSCell, and so on. Additionally or alternatively, the wireless nodes may be distributed among different base stations. For example, a PCell may correspond to a wireless node of a first base station 105, and an SCell may correspond to a wireless node of a different base station 105.

[0083] Various devices in the wireless communication system 100 may support one or more cross-carrier scheduling schemes as described herein. For example, a UE 115 may monitor the search space of a scheduled SCell (e.g., a user-specific search space associated with DCI) in addition to the search space of a scheduled PCell (e.g., a common search space of a PCell associated with one or more mobility and connectivity functions). Such a cross-carrier scheduling scheme may result in efficient communication while implementing various functions associated with a primary cell. In some examples, the techniques described herein may also enable a UE 115 to be configured (e.g., by one or more base stations 105) with one or more parameters for monitoring various search spaces. For example, a UE 115 may be configured with a number of search spaces (e.g., a number of search spaces including or excluding the user-specific search space of the PCell) that meet a threshold (e.g., less than or equal to) to monitor, such as a pre-configured threshold or a threshold associated with the UE's capabilities. Additionally or alternatively, a UE 115 may be configured with a user-specific search space for the SCell, and the UE 115 may also be configured with a user-specific search space for the PCell (e.g., the user-specific search spaces may correspond to the same search space identifier). The UE 115 may determine an indication of the number of decoding candidates configured for the user-specific search space of the PCell and utilize such parameters to identify one or more decoding candidate sets to monitor on the SCell (eg, based on the CIF value).

[0084] Figure 2 An example of a wireless communication system 200 that supports cross-carrier scheduling techniques for a wireless communication system according to aspects of the present disclosure is shown. In some examples, the wireless communication system 200 can implement aspects of the wireless communication system 100. For example, the wireless communication system 200 can include a UE 215, which can be a reference Figure 1 The wireless communication system 200 may also include a PCell 205 and an SCell 206, where the PCell 205 and the SCell 206 may be associated with one or more base stations 105 as described herein. In general, the wireless communication system 200 may illustrate an example of cross-carrier scheduling between the PCell 205 and the SCell 206 according to the techniques described herein.

[0085] In wireless communication system 200, PCell 205 can serve as a serving cell for geographic coverage area 210-a, and SCell 206 can serve as a serving cell for geographic coverage area 210-b. PCell 205 and SCell 206 can establish communication with UE 215. For example, PCell 205 and SCell 206 can send control transmissions 220 to UE 215. UE 215 can communicate data transmissions 225 (e.g., PDSCH transmissions, PUSCH transmissions, etc.) with PCell 205 or SCell 206. Figure 2 As shown, UE 215 can concurrently communicate with PCell 205 and SCell 206, for example, in a CA configuration. UE 215 can monitor one or more search spaces on PCell 205 and one or more search spaces on SCell 206 for PDCCH candidates.

[0086] Wireless communication system 200 may implement cross-carrier scheduling as described herein. In some examples, PCell 205 may be an example of a scheduling cell, and SCell 206 may be an example of a scheduled cell. For example, PCell 205 may schedule UE 215 for communication with SCell 206. In these examples, PCell 205 may send a control transmission 220-a to UE 215. Control transmission 220-a may indicate a data transmission 225-b from SCell 206 to UE 215. For example, control transmission 220-a may include DCI (e.g., a DCI format) indicating resources reserved for data transmission 225-b. UE 215 may monitor a CORESET corresponding to PCell 205 for control transmission 220-a. For example, UE 215 may monitor one or more user-specific search spaces of PCell 205 (e.g., a PDCCH control candidate set of a user-specific search space for DCI) for control transmission 220-a. UE 215 may identify that control transmission 220-a includes cross-carrier scheduling information based on one or more parameters of the DCI. For example, the DCI may include a CIF indicating the cell corresponding to the scheduled data transmission 225-b (e.g., a CIF value of 1 for SCell 206 and a CIF value of 0 for PCell 205, or vice versa).

[0087] Additionally or alternatively, the UE 215 may be configured to monitor one or more common search spaces of the PCell 205 for other control information (e.g., common control information associated with a set of UEs 115 communicating with the PCell 205). For example, the UE 215 may monitor the PDCCH control candidate set included in each common search space for control information associated with one or more functions, such as mobility and / or connectivity functions (e.g., fallback operation, PDCCH ordering configuration, beam failure recovery operation, semi-persistent scheduling or configured grant scheduling activation or deactivation, etc.). Such common search spaces may include a type 0 common search space, a type 0A common search space, a type 1 common search space, a type 2 common search space, a type 3 common search space, or any combination thereof.

[0088] The technology described herein can provide enhanced cross-carrier scheduling. For example, SCell 206 can be an example of a scheduling cell, and PCell 205 can be an example of a scheduled cell. Such an example can achieve one or more advantages. For example, PCell 205 can be an example of an NR dynamic spectrum sharing (DSS) cell, and SCell 206 can be an example of a non-DSS cell. In this case, PCell 205 can serve a relatively larger number of devices than SCell 206, and can implement increased resource utilization, reduced latency, and efficient communication by providing scheduling for UE 215 at SCell 206. However, UE 215 may not be able to monitor the PDCCH candidates of the search space on PCell 205 because UE 215 may expect to receive control information from SCell 206. As a result, UE 215 may miss control information associated with the operation configured by PCell 205, such as connectivity or mobility functions. Therefore, missing the control information on PCell 205 may cause the efficiency of wireless communication at UE 215 to be reduced or the reliability to be reduced.

[0089] Thus, the UE 215 may be configured to jointly monitor one or more common search spaces of the PCell 205 and one or more user-specific search spaces of the SCell 206. For example, the UE 215 may monitor the user-specific search space of the SCell 206 for cross-carrier scheduling information (e.g., DCI of a control transmission 220-b indicating a data transmission 225-a with the PCell 205), and the UE 215 may also monitor the common search space of the PCell 205 for other control information (e.g., control information associated with one or more functions supported by the PCell 205).

[0090] In some examples, UE 215 may determine one or more parameters of a CA configuration that supports cross-carrier scheduling from SCell 206 (e.g., a scheduling cell) to PCell 205 (e.g., a scheduled cell). For example, UE 215 may be configured with a user-specific search space for SCell 206 (e.g., to monitor PDCCH candidates for control transmission 220-b). UE 215 may determine a search space identifier for the user-specific search space for PCell 205 based on the configured user-specific search space for SCell 206. For example, UE 215 may use the same search space identifier for SCell 206 and PCell 205. UE 215 may determine one or more parameters for the user-specific search space for PCell 205 based on the determined or configured search space identifier. As an example, UE 215 may determine an indication of the number of decoding candidates configured for the user-specific search space for PCell 205 (e.g., an nrofCandidates parameter), a CIF value corresponding to PCell 205, and the like. The UE 215 may utilize the one or more parameters to monitor the user-specific search space of the SCell 206, which may reduce signaling overhead in the wireless communication system (e.g., the SCell 206 may avoid transmitting one or more parameters of the configured user-specific search space of the PCell 205). For example, the UE 215 may determine various numbers of decoding candidates for the SCell 206 based on the one or more parameters to monitor information associated with the SCell 206 and / or the PCell 205.

[0091] Additionally or alternatively, UE 215 may be configured to monitor a number of search spaces for each bandwidth portion of each cell that is less than a threshold number of search spaces (e.g., a threshold based on UE capabilities or a pre-configured threshold). In some examples, a user-specific search space for PCell 205 (e.g., a "virtual" search space that UE 215 may not monitor) may be included in the number of search spaces. In such an example, by including the user-specific search space for PCell 205 in the number of search spaces, UE 215 may not need to distinguish whether the search space is a user-specific search space for PCell 205, which may result in simplified UE processing (e.g., reducing processing overhead at UE 215). In some other examples, the user-specific search space for PCell 205 may not be included in the number of search spaces. In such an example, excluding the user-specific search space for PCell 205 from the number of search spaces may result in one or more advantages. For example, search spaces that the UE 215 may not monitor (eg, user-specific search spaces of the PCell 205) may not be counted (eg, considered a threshold number of search spaces) so that the number of search spaces monitored by the UE 215 may be relatively high.

[0092] Figure 3 An example of a scheduling scheme 300 supporting cross-carrier scheduling techniques for a wireless communication system according to aspects of the present disclosure is shown. In some examples, the scheduling scheme 300 can implement aspects of the wireless communication systems 100 and 200. For example, the scheduling scheme 300 can be associated with communications between a PCell 305, an SCell 306, and a UE, which can be a reference to Figure 1 and Figure 2 Examples of corresponding devices and communications are described.

[0093] The UE can establish communication with the PCell 305. The PCell 305 can be an example of a PCell of an MCG, a PSCell of an SCG, or any other example of a cell that supports primary cell functions (e.g., mobility and / or connectivity functions). In some cases, the PCell 305 can support DSS communication. The UE can also establish communication with the SCell 306. The SCell 306 can be an example of an SCell of an MCG, an SCG, etc. In some cases, the SCell 306 may not support DSS communication.

[0094] As shown in the scheduling scheme 300, the SCell 306 can be an example of a scheduling cell and the PCell 305 can be an example of a scheduled cell. For example, the UE can monitor one or more search spaces (e.g., user-specific search spaces) associated with the SCell 306 for a control transmission 320-a. The control transmission 320-a can include cross-carrier scheduling information indicating a data transmission 325-a between the UE and the PCell 305 (e.g., the control transmission 320-a can include DCI, such as a CIF, an indication of resources allocated for the data transmission 325-a, and other examples of downlink control information). In some examples, the data transmission 325-a can include an uplink transmission from the UE to the PCell 305 (e.g., a PUSCH transmission), a downlink transmission from the PCell 305 to the UE (e.g., a PDSCH transmission), or both in other examples of communication.

[0095] The UE may be configured to monitor one or more search spaces of a CORESET 310-a. The CORESET 310-a may be associated with a PCell 305 and may include one or more common search spaces 315 for a set of UEs communicating with the PCell 305 and / or user-specific search spaces for the UEs. As an illustrative example, the UE may be configured to monitor the common search space 315-a for control information associated with the PCell 305 (e.g., control information related to data transmission 325, control information associated with one or more functions of the PCell 305 (e.g., mobility and / or connectivity functions), common control information intended for multiple UEs, and other examples of control information associated with the PCell 305).

[0096] The UE may be configured by the PCell 305 to monitor one or more search spaces (e.g., common search space 315-a) of the PCell 305. In some examples, the UE may be configured with an indication of the search space configuration of a "mirrored" scheduling cell (e.g., SCell 306) in order to determine the search space configuration of the scheduled cell (e.g., PSCell 305). Additionally or alternatively, one or more optional fields of the control signaling (e.g., PDCCH configuration signaling) indicating the search space configuration of the PCell may be valid (e.g., may be considered as an exception to the "mirrored" search space configuration). For example, the UE may avoid referencing at least a portion of the search space configuration in the PDCCH configuration of the SCell 306. In such an example, the UE may be configured with the search space configuration in the PDCCH configuration of the PCell 305. The UE may monitor the common search space 315-a of the PCell 305 based on the search space configuration.

[0097] In some examples, the common search space 315-a can be an example of a type 3 common search space. For example, the UE can monitor the common search space 315-a on the PCell 305 using a cell radio network temporary identifier (C-RNTI) (e.g., a C-RNTI identified as part of a connection process or based on monitoring the common search space 315-a), which can enable the UE to perform various operations to enhance communications. For example, the UE can perform fallback operations, PDCCH ordering configuration, beam failure recovery operations, semi-persistent scheduling or configured grant scheduling activation or deactivation, and other operation examples enabled via type 3 common search space information (e.g., information decoded using the C-RNTI).

[0098] Additionally or alternatively, the common search space 315-a may be an example of another type of common search space. For example, the common search space 315-a may be an example of a type 0 common search space, a type 0A common search space, a type 1 common search space, a type 2 common search space, etc. In some cases, the UE may be configured to monitor any combination of one or more common search spaces 315 of the PCell 305 for control information associated with the PCell 305 (or SCell 306).

[0099] Figure 4 An example of a scheduling scheme 400 supporting cross-carrier scheduling techniques for a wireless communication system according to aspects of the present disclosure is shown. In some examples, the scheduling scheme 400 can implement aspects of the wireless communication systems 100 and 200. For example, the scheduling scheme 400 can be associated with communications between a PCell 405, an SCell 406, and a UE, which can be a reference to Figures 1 to 3 Examples of corresponding devices and communications are described.

[0100] As shown in the scheduling scheme 400, the SCell 406 may be an example of a scheduling cell, and the PCell 405 may be an example of a scheduled cell. The UE may monitor the CORESET 410-b of the SCell 406 for downlink control messages (e.g., DCI that schedules data transmission between the UE and the PCell 405). For example, the UE may monitor one or more decoding candidates (e.g., PDCCH candidates 425) of one or more user-specific search spaces 420, such as the user-specific search space 420-b. As described herein with reference to Figure 1-3As described above, the UE may also monitor the CORESET 410-a of the PCell 405 for other control information. For example, the UE may monitor the common search space 415-a, which may be an example of the common search space 315-a. By monitoring the CORESET 410-a of the PCell 405, one or more functions of the PCell 405 (e.g., connectivity and mobility functions, among other examples) may be provided to the UE, which may enable more efficient and robust communications.

[0101] Additionally or alternatively, the UE may be configured to monitor the user-specific search space 420-b according to the CA configuration. For example, the SCell 406 (e.g., the scheduling cell) may configure the UE with one or more parameters associated with the user-specific search space 420-b. The one or more parameters may include a search space identifier corresponding to the user-specific search space 420-b. The PCell 405 (e.g., the scheduled cell) may configure the UE with one or more parameters associated with the user-specific search space 420-a. In some examples, the UE may be configured with a search space identifier corresponding to the user-specific search space 420-b that is the same as the search space identifier corresponding to the user-specific search space 420-a. The UE may identify one or more CA configuration parameters based on the configuration of the user-specific search space 420-a and the configuration of the user-specific search space 420-b.

[0102] For example, the UE may identify a configuration parameter indicating the number of decoding candidates configured by the PCell 405 for the user-specific search space 420-a (e.g., an nrofCandidates parameter per aggregation level). In some examples, the PCell 405 may avoid indicating other configuration parameters for the user-specific search space 420. In other words, the configuration of the user-specific search space 420 may include one or more parameters (e.g., the nrofCandidates parameter), but may not include other parameters, which may result in reduced signaling overhead (e.g., compared to signaling other parameters that may not be used if the UE does not monitor the user-specific search space 420-a as described herein).

[0103] The UE may also identify other configuration parameters associated with the CA configuration, such as a CIF value corresponding to SCell 406 (e.g., a CIF value of 1 or 0) and a CIF value corresponding to PCell 405 (e.g., a CIF value of 1 or 0). As an example, the UE may identify one or both CIF values ​​based on DCI (e.g., unicast DCI intended for the UE, broadcast DCI intended for a set of UEs, etc.). The UE may monitor one or more PDCCH candidates 425 of the user-specific search space 420-b based on the identified parameters, such as PDCCH candidates 425 of the scheduling cell SCell 406. For example, the UE may monitor a first set 425-a of PDCCH candidates based on a configuration parameter indicating the number of decoding candidates. In other words, for a CIF value of 0 indicating PCell 405 and the nrofCandidates parameter, the UE may monitor a first number of PDCCH candidates 425 for information corresponding to PCell 405 (e.g., scheduling information for data transmission between the UE and PCell 405). The first number may be indicated by the nrofCandidates parameter. Additionally or alternatively, for a CIF value of 1 indicating the SCell 406 and the nrofCandidates parameter, the UE may determine a second number of PDCCH candidates 425 to monitor for information corresponding to the SCell 406, such as a second set of PDCCH candidates 425-b. By identifying configuration parameters between cells, the system may achieve reduced signaling overhead in the wireless communication system (e.g., the SCell 206 may avoid sending signaling indicating some parameters of the user-specific search space 420-b).

[0104] In some examples, the UE may be configured to monitor a number of search spaces that meets a threshold. The threshold may be the number of search spaces that the UE may monitor based on the capabilities of the UE (e.g., the UE may indicate to the PCell 405 and / or SCell 406 a threshold number of search spaces that the UE may be able to monitor) or a pre-configured threshold number of search spaces. In some examples, the threshold may be the number of search spaces per bandwidth portion of each cell. Thus, the PCell 405 and / or SCell 406 may configure the UE to monitor a number of search spaces that meets the threshold. In some examples, the UE may not monitor the user-specific search space 420-a (e.g., the user-specific search space 420-a may be a "virtual" search space configured to signal CA configuration parameters, but there may be no communications of the UE scheduled in the user-specific search space 420-a). In some cases, the user-specific search space 420-a may be included in the number of search spaces (e.g., the common search space 415-a and the user-specific search space 420-a may be considered to be two search spaces in the threshold number of search spaces that the UE may monitor). Such an example can ensure that the threshold is met, which can lead to reliable communication. In some other cases, the user-specific search space 420-a may not be included in the number of search spaces (e.g., the common search space 415-a and the user-specific search space 420-a may be considered as one search space in a threshold number of search spaces that the UE may monitor). Such an example can achieve enhanced resource utilization and increased system throughput (e.g., the UE may be configured to monitor another search space).

[0105] Figure 5 An example of a process flow 500 for supporting cross-carrier scheduling techniques for a wireless communication system according to aspects of the present disclosure is shown. In some examples, the process flow 500 can implement aspects of the wireless communication systems 100 and 200. For example, the process flow 500 can include example operations associated with one or more of the PCell 505, the SCell 506, or the UE 515, which can be referenced. Figure 1 and Figure 2Examples of corresponding devices described. In the following description of the process flow 500, the operations between the PCell 505, the SCell 506, and the UE 515 can be performed in a different order than the example order shown, or the operations performed by the PCell 505, the SCell 506, and the UE 515 can be performed in a different order or at a different time. Some operations can also be omitted from the process flow 500, and other operations can be added to the process flow 500. The operations performed by the PCell 505, the SCell 506, and the UE 515 can support improvements to the communication operations of the UE 515, and in some examples, can promote improvements to the UE 515 implementation of cross-carrier scheduling, as well as other advantages.

[0106] At 520, the UE 515 may establish communication with the PCell 505 and the SCell 506. The UE 515 may communicate concurrently with the PCell 505 and the SCell 506, for example, in a CA configuration. In some examples, at 520, the PCell 505 may configure the UE 515 with parameters of the CA configuration (e.g., parameters of one or more search spaces as described herein). Additionally or alternatively, the SCell 506 may configure the UE 515 with parameters of the CA configuration.

[0107] In some examples, at 525, UE 515 can identify a CA configuration. For example, UE 515 can identify that SCell 506 is a scheduling cell and PCell 505 is a scheduled cell (e.g., cross-carrier scheduling). UE 515 can also determine one or more configuration parameters of the CA configuration, as described herein with reference to FIG. Figure 1-Figure 4 For example, the UE 515 may identify the number of PDCCH candidate parameters, one or more CIF parameters, and the like.

[0108] At 530, the UE 515 may monitor the search spaces of the PCell 505 and the SCell 506 for control information (e.g., based on the identified CA configuration). For example, the UE 515 may monitor PDCCH candidates of one or more search spaces (e.g., common search spaces) on the PCell 505 and one or more search spaces (e.g., user-specific search spaces) on the SCell 506 according to the CA configuration. Additionally, at 530, the PCell 505 and the SCell 506 may determine which PDCCH candidate to use to send control information to the UE 515.

[0109] At 535, the UE 515 may receive control information from the PCell 505 and the SCell 506. For example, the PCell 505 may send control information (e.g., control information related to the communication at 540, one or more mobility and / or connectivity operations, etc.) via the common search space and the SCell 506 may send DCI (e.g., a cross-carrier scheduling indication for the communication at 540) via the user-specific search space.

[0110] At 540, UE 515 may communicate with PCell 505 via a scheduled data transmission based on the control information received at 535. In some examples, UE 515 may communicate with SCell 506 via a second data transmission based on the received control information. In some examples, the data transmission may include PDSCH transmissions, PUSCH transmissions, and other types of communications.

[0111] Figure 6 A block diagram 600 of a device 605 supporting cross-carrier scheduling techniques for a wireless communication system according to aspects of the present disclosure is shown. The device 605 may be an example of aspects of the UE 115 as described herein. The device 605 may include a receiver 610, a communication manager 615, and a transmitter 620. The device 605 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0112] The receiver 610 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to cross-carrier scheduling techniques for wireless communication systems). The information may be passed to other components of the device 605. The receiver 610 may be a reference Figure 9 Examples of aspects of the transceiver 920 are described. The receiver 610 may utilize a single antenna or a collection of antennas.

[0113] The communication manager 615 may recognize that the UE is communicating with a primary cell and a secondary cell in a carrier aggregation configuration, wherein the primary cell is a cross-carrier scheduled cell and the secondary cell is a cross-carrier scheduled cell, receive downlink control information from the secondary cell, wherein the downlink control information includes a cross-carrier scheduling indication related to scheduling of data transmission by the primary cell, monitor a common search space of the primary cell for control information related to communication with the primary cell as a cross-carrier scheduled cell, and communicate with the primary cell via data transmission based on at least one of the downlink control information from the secondary cell and the control information from the common search space of the primary cell. The communication manager 615 may be an example of aspects of the communication manager 910 described herein.

[0114] The communication manager 615 as described herein can be implemented to achieve one or more potential advantages. One embodiment can enable the device 605 to increase resource utilization and reduce latency by receiving control information on various serving cells (e.g., PCell and SCell) in a carrier aggregation configuration. For example, the device 605 can receive DCI from the SCell that schedules communications on the PCell while maintaining various PCell functions via control information sent on the PCell's common search space.

[0115] The processor of the device 605 (e.g., controlling the receiver 610, the communication manager 615, or the transmitter 620) may also realize one or more potential advantages. For example, the processor of the device 605 may identify parameters of the user-specific search space of the scheduling cell (e.g., SCell) based on the configuration of the user-specific search space on the scheduled cell (e.g., PCell), which may reduce power consumption and signaling overhead associated with configuring the device 605 with a CA configuration.

[0116] The communication manager 615 or its subcomponents may be implemented in hardware, code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functionality of the communication manager 615 or its subcomponents may be performed by a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functionality described herein.

[0117] The communication manager 615 or its subcomponents can be physically located in a variety of locations, including being distributed so that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, the communication manager 615 or its subcomponents can be independent and distinct components according to various aspects of the present disclosure. In some examples, the communication manager 615 or its subcomponents can be combined with one or more other hardware components, including but not limited to input / output (I / O) components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof according to various aspects of the present disclosure.

[0118] The transmitter 620 can transmit signals generated by other components of the device 605. In some examples, the transmitter 620 can be collocated with the receiver 610 in the transceiver module. For example, the transmitter 620 can be a reference Figure 9 Examples of aspects of the transceiver 920 are described. The transmitter 620 may utilize a single antenna or a collection of antennas.

[0119] Figure 7A block diagram 700 of a device 705 supporting cross-carrier scheduling techniques for a wireless communication system according to aspects of the present disclosure is shown. The device 705 may be an example of aspects of the device 605 or UE 115 as described herein. The device 705 may include a receiver 710, a communication manager 715, and a transmitter 740. The device 705 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0120] The receiver 710 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to cross-carrier scheduling techniques for wireless communication systems). The information may be passed to other components of the device 705. The receiver 710 may be a reference Figure 9 Examples of aspects of the transceiver 920 are described. The receiver 710 may utilize a single antenna or a collection of antennas.

[0121] Communication manager 715 may be an example of aspects of communication manager 615 as described herein. Communication manager 715 may include aggregation component 720, secondary cell component 725, primary cell component 730, and data component 735. Communication manager 715 may be an example of aspects of communication manager 910 as described herein.

[0122] Aggregation component 720 can identify that the UE communicates with a primary cell and a secondary cell in a carrier aggregation configuration, where the primary cell is a cell scheduled across carriers and the secondary cell is a cross-carrier scheduled cell.

[0123] The secondary cell component 725 can receive downlink control information from the secondary cell, wherein the downlink control information includes a cross-carrier scheduling indication for scheduling data transmission with the primary cell.

[0124] The primary cell component 730 can monitor the common search space of the primary cell for control information related to communications with the primary cell as a cross-carrier scheduled cell.

[0125] The data component 735 can communicate with the primary cell via data transmission based on at least one of downlink control information from the secondary cell and control information from a common search space of the primary cell.

[0126] The transmitter 740 can transmit signals generated by other components of the device 705. In some examples, the transmitter 740 can be collocated with the receiver 710 in the transceiver module. For example, the transmitter 740 can be a reference Figure 9 Examples of aspects of the transceiver 920 are described. The transmitter 740 may utilize a single antenna or a collection of antennas.

[0127] Figure 8A block diagram 800 of a communication manager 805 supporting cross-carrier scheduling techniques for a wireless communication system according to aspects of the present disclosure is shown. The communication manager 805 can be an example of aspects of the communication manager 615, the communication manager 715, or the communication manager 910 described herein. The communication manager 805 can include an aggregation component 810, a secondary cell component 815, a primary cell component 820, a data component 825, an identifier component 830, a parameter component 835, a monitoring component 840, a search space number component 845, a threshold component 850, and an operation component 855. Each of these modules can communicate with each other directly or indirectly (e.g., via one or more buses).

[0128] Aggregation component 810 can identify that the UE communicates with a primary cell and a secondary cell in a carrier aggregation configuration, where the primary cell is a cell scheduled across carriers and the secondary cell is a cross-carrier scheduled cell.

[0129] The secondary cell component 815 can receive downlink control information from the secondary cell, wherein the downlink control information includes a cross-carrier scheduling indication for scheduling data transmission with the primary cell.

[0130] The primary cell component 820 can monitor the common search space of the primary cell for control information related to communications with the primary cell as a cross-carrier scheduled cell.

[0131] The data component 825 can communicate with the primary cell via data transmission based on at least one of downlink control information from the secondary cell and control information from a common search space of the primary cell.

[0132] In some examples, the data component 825 can receive a downlink data transmission for the primary cell, send an uplink data transmission for the primary cell, or both.

[0133] Identifier component 830 can identify a search space identifier associated with a user-specific search space of a secondary cell.

[0134] In some examples, identifier component 830 can identify the cell radio network temporary identifier based on monitoring the common search space of the primary cell for control information. In some cases, the search space identifier associated with the user-specific search space of the secondary cell is the same as the search space identifier associated with the user-specific search space of the primary cell.

[0135] Parameter component 835 can determine one or more configuration parameters associated with a user-specific search space of the primary cell based on the search space identifier.In some cases, the one or more configuration parameters include a per-aggregation level indication of a number of downlink control channel candidates to monitor.

[0136] The monitoring component 840 may monitor a number of downlink control channel candidates in a user-specific search space of a secondary cell for downlink control information, wherein the number of downlink control channel candidates is based on one or more configuration parameters. In some examples, the monitoring component 840 may monitor a first number of downlink control channel candidates in the secondary cell for information associated with the secondary cell. In some examples, the monitoring component 840 may monitor a second number of downlink control channel candidates in the secondary cell for information associated with the primary cell. In some examples, the monitoring component 840 may determine the first number of downlink control channel candidates based on a carrier indicator field corresponding to the secondary cell. In some examples, the monitoring component 840 may determine the second number of downlink control channel candidates based on a carrier indicator field corresponding to the primary cell, wherein the downlink control information includes both a carrier indicator field corresponding to the secondary cell and a carrier indicator field corresponding to the primary cell.

[0137] In some examples, monitoring component 840 can monitor one or more downlink control channel candidates of a user-specific search space of the secondary cell for downlink control information.

[0138] In some examples, monitoring component 840 may monitor a user-specific search space of the secondary cell using a cell radio network temporary identifier, wherein receiving downlink control information from the secondary cell is based on monitoring the user-specific search space of the secondary cell.

[0139] In some examples, monitoring component 840 can monitor the type 0 common search space of the primary cell, the type 0A common search space of the primary cell, the type 1 common search space of the primary cell, the type 2 common search space of the primary cell, the type 3 common search space of the primary cell, or any combination thereof.

[0140] The number of search spaces component 845 can identify the number of search spaces that the UE monitors on the primary cell and the secondary cell, where the number of search spaces includes a common search space of the primary cell and a user-specific search space of the secondary cell. In some cases, the number of search spaces does not include the user-specific search space of the primary cell. In some cases, the number of search spaces includes the user-specific search space of the primary cell.

[0141] Threshold component 850 can determine whether the number of search spaces is less than or equal to a maximum number of search spaces that the UE is configured to monitor per bandwidth part.

[0142] Operation component 855 can perform one or more connectivity operations or mobility operations based on the control information related to communication with the primary cell.

[0143] Figure 9A diagram of a system 900 including a device 905 that supports cross-carrier scheduling techniques for a wireless communication system according to aspects of the present disclosure is shown. Device 905 may be an example of or include components of device 605, device 705, or UE 115 as described herein. Device 905 may include components for two-way voice and data communications, including components for sending and receiving communications, including a communication manager 910, an I / O controller 915, a transceiver 920, an antenna 925, a memory 930, and a processor 940. These components may communicate electronically via one or more buses (e.g., bus 945).

[0144] The communication manager 910 can identify that the UE communicates with a primary cell and a secondary cell in a carrier aggregation configuration, wherein the primary cell is a cell scheduled across carriers and the secondary cell is a cross-carrier scheduled cell, receive downlink control information from the secondary cell, wherein the downlink control information includes a cross-carrier scheduling indication for scheduling data transmission with the primary cell, monitor the common search space of the primary cell for control information related to communication with the primary cell, and communicate with the primary cell via data transmission based on at least one of the downlink control information from the secondary cell and the control information from the common search space of the primary cell.

[0145] I / O controller 915 can manage input and output signals for device 905. I / O controller 915 can also manage peripheral devices that are not integrated into device 905. In some cases, I / O controller 915 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 915 can utilize a controller such as or another known operating system. In other cases, I / O controller 915 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, I / O controller 915 may be implemented as part of a processor. In some cases, a user may interact with device 905 via I / O controller 915 or via hardware components controlled by I / O controller 915.

[0146] The transceiver 920 can communicate bidirectionally via one or more antennas, wired or wireless links as described above. For example, the transceiver 920 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 920 can also include a modem for modulating packets and providing the modulated packets to the antenna for transmission, and demodulating packets received from the antenna.

[0147] In some cases, a wireless device may include a single antenna 925. However, in some cases, a device may have more than one antenna 925, which may be capable of transmitting or receiving multiple wireless transmissions simultaneously.

[0148] The memory 930 may include random access memory (RAM) and read-only memory (ROM). The memory 930 may store computer-readable computer executable code 935, which includes instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, the memory 930 may include a basic input / output system (BIOS), which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0149] The processor 940 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, the processor 940 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into the processor 940. The processor 940 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 930) to cause the device 905 to perform various functions (e.g., functions or tasks supporting cross-carrier scheduling techniques for wireless communication systems).

[0150] The code 935 may include instructions for implementing aspects of the present disclosure, including instructions for supporting wireless communications. The code 935 may be stored in a non-transitory computer-readable medium such as system memory or other types of memory. In some cases, the code 935 may not be directly executed by the processor 940, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0151] Figure 10 A block diagram 1000 of a device 1005 supporting cross-carrier scheduling techniques for a wireless communication system according to aspects of the present disclosure is shown. The device 1005 may be an example of aspects of a base station 105 as described herein. For example, the device 1005 may be an example of a primary cell and a secondary cell, although it should be understood that various operations associated with the primary cell and / or the secondary cell may be performed at separate devices (e.g., different base stations 105). Thus, in some instances, the device 1005 may represent a base station that includes both a primary cell and a secondary cell. In other instances, the device 1005 may represent a base station that acts as a primary cell or a base station that acts as a secondary cell. The device 1005 may include a receiver 1010, a communication manager 1015, and a transmitter 1020. The device 1005 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0152] The receiver 1010 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to cross-carrier scheduling techniques for wireless communication systems). The information may be passed to other components of the device 1005. The receiver 1010 may be a reference Figure 13 Examples of aspects of the transceiver 1320 are described. The receiver 1010 may utilize a single antenna or a collection of antennas.

[0153] The communication manager 1015 may recognize that the UE communicates with a primary cell and a secondary cell in a carrier aggregation configuration, wherein the primary cell is a cell scheduled across carriers and the secondary cell is a cross-carrier scheduled cell, transmit control information related to communication with the primary cell on a common search space of the primary cell, transmit downlink control information on a user-specific search space of the secondary cell, wherein the downlink control information includes a cross-carrier scheduling indication for scheduled data transmission with the primary cell, and communicate with the UE via data transmission in the primary cell based on at least one of the downlink control information and the control information related to communication with the primary cell. The communication manager 1015 may be an example of aspects of the communication manager 1310 described herein.

[0154] The communication manager 1015 or its subcomponents may be implemented by hardware, code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 1015 or its subcomponents may be performed by a general-purpose processor, a DSP, an application-specific integrated circuit (ASIC), an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein.

[0155] The communication manager 1015 or its subcomponents can be physically located in a variety of locations, including being distributed so that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, the communication manager 1015 or its subcomponents can be independent and distinct components according to various aspects of the present disclosure. In some examples, the communication manager 1015 or its subcomponents can be combined with one or more other hardware components, including but not limited to input / output (I / O) components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof according to various aspects of the present disclosure.

[0156] Transmitter 1020 can transmit signals generated by other components of device 1005. In some examples, transmitter 1020 can be collocated with receiver 1010 in a transceiver module. For example, transmitter 1020 can be a reference Figure 13 Examples of aspects of the transceiver 1320 are described. The transmitter 1020 may utilize a single antenna or a collection of antennas.

[0157] Figure 11 A block diagram 1100 of a device 1105 supporting cross-carrier scheduling techniques for a wireless communication system according to aspects of the present disclosure is shown. The device 1105 may be an example of aspects of the device 1005 or base station 105 as described herein. The device 1105 may include a receiver 1110, a communication manager 1115, and a transmitter 1140. The device 1105 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0158] The receiver 1110 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to cross-carrier scheduling techniques for wireless communication systems). The information may be passed to other components of the device 1105. The receiver 1110 may be a reference Figure 13 Examples of aspects of the transceiver 1320 are described. The receiver 1110 may utilize a single antenna or a collection of antennas.

[0159] The communication manager 1115 can be an example of aspects of the communication manager 1015 as described herein. The communication manager 1115 can include a carrier aggregation component 1120, a common search space component 1125, a user-specific search space component 1130, and a data module 1135. The communication manager 1115 can be an example of aspects of the communication manager 1310 described herein.

[0160] The carrier aggregation component 1120 can recognize that the UE communicates with a primary cell and a secondary cell in a carrier aggregation configuration, where the primary cell is a cell scheduled across carriers and the secondary cell is a cross-carrier scheduled cell.

[0161] The common search space component 1125 can transmit control information related to communications with the primary cell on the common search space of the primary cell.

[0162] The user-specific search space component 1130 can send downlink control information on the user-specific search space of the secondary cell, wherein the downlink control information includes a cross-carrier scheduling indication for scheduling data transmission with the primary cell.

[0163] The data module 1135 may communicate with the UE via data transmission of the primary cell according to at least one of downlink control information and control information regarding communication with the primary cell.

[0164] The transmitter 1140 can transmit signals generated by other components of the device 1105. In some examples, the transmitter 1140 can be collocated with the receiver 1110 in the transceiver module. For example, the transmitter 1140 can be a reference Figure 13Examples of aspects of the transceiver 1320 are described. The transmitter 1140 may utilize a single antenna or a collection of antennas.

[0165] Figure 12 A block diagram 1200 is shown of a communication manager 1205 that supports cross-carrier scheduling techniques for a wireless communication system according to aspects of the present disclosure. The communication manager 1205 can be an example of aspects of the communication manager 1015, the communication manager 1115, or the communication manager 1310 described herein. The communication manager 1205 can include a carrier aggregation component 1210, a common search space component 1215, a user-specific search space component 1220, a data module 1225, a CIF component 1230, a capability receiver 1235, and a threshold module 1240. Each of these modules can communicate with each other directly or indirectly (e.g., via one or more buses).

[0166] The carrier aggregation component 1210 can recognize that the UE communicates with a primary cell and a secondary cell in a carrier aggregation configuration, where the primary cell is a cell scheduled across carriers and the secondary cell is a cross-carrier scheduled cell.

[0167] The common search space component 1215 can transmit control information related to communications with the primary cell on a common search space of the primary cell. In some cases, the common search space of the primary cell includes a type 0 common search space of the primary cell, a type 0A common search space of the primary cell, a type 1 common search space of the primary cell, a type 2 common search space of the primary cell, a type 3 common search space of the primary cell, or any combination thereof.

[0168] The user-specific search space component 1220 can send downlink control information on a user-specific search space of the secondary cell, wherein the downlink control information includes a cross-carrier scheduling indication for scheduling data transmission with the primary cell. In some examples, the user-specific search space component 1220 can configure the user-specific search space of the primary cell with a per-aggregation level indication of the number of downlink control channel candidates to monitor. In some examples, the user-specific search space component 1220 can configure the UE with a search space identifier for the user-specific search space of the primary cell and a search space identifier for the user-specific search space of the secondary cell. In some cases, the search space identifier for the user-specific search space of the primary cell is the same as the search space identifier for the user-specific search space of the secondary cell.

[0169] The data module 1225 may communicate with the UE via data transmission of the primary cell according to at least one of downlink control information and control information regarding communication with the primary cell.

[0170] The CIF component 1230 may send a carrier indicator field for the primary cell, a carrier indicator field for the secondary cell, or both to the UE.

[0171] The capability receiver 1235 may receive an indication of the capabilities of the UE.

[0172] The threshold module 1240 can configure the UE to monitor a number of search spaces that meets a threshold number of search spaces for the UE to monitor in each bandwidth part based on the UE's capabilities, where the number of search spaces includes a common search space of a primary cell and a user-specific search space of a secondary cell. In some cases, the number of search spaces includes a user-specific search space of the primary cell. In some cases, the number of search spaces does not include a user-specific search space of the primary cell.

[0173] Figure 13 A diagram of a system 1300 including a device 1305 supporting cross-carrier scheduling techniques for a wireless communication system according to aspects of the present disclosure is shown. Device 1305 may be an example of or include components of device 1005, device 1105, or base station 105 as described herein. Device 1305 may include components for two-way voice and data communications, including components for sending and receiving communications, including a communication manager 1310, a network communication manager 1315, a transceiver 1320, an antenna 1325, a memory 1330, a processor 1340, and an inter-station communication manager 1345. These components may communicate electronically via one or more buses (e.g., bus 1350).

[0174] The communication manager 1310 can recognize that the UE communicates with a primary cell and a secondary cell in a carrier aggregation configuration, wherein the primary cell is a cell scheduled across carriers and the secondary cell is a cross-carrier scheduled cell, send control information related to communication with the primary cell on a common search space of the primary cell, send downlink control information on a user-specific search space of the secondary cell, wherein the downlink control information includes a cross-carrier scheduling indication for scheduling data transmission with the primary cell, and communicate with the UE via data transmission of the primary cell based on at least one of the downlink control information and the control information related to communication with the primary cell.

[0175] The network communications manager 1315 may manage communications with the core network (eg, via one or more wired backhaul links). For example, the network communications manager 1315 may manage the delivery of data communications for client devices such as one or more UEs 115 .

[0176] The transceiver 1320 can communicate bidirectionally via one or more antennas, wired or wireless links, as described above. For example, the transceiver 1320 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 1320 can also include a modem for modulating packets and providing the modulated packets to the antenna for transmission, and demodulating packets received from the antenna.

[0177] In some cases, a wireless device may include a single antenna 1325. However, in some cases, a device may have more than one antenna 1325, which may be capable of transmitting or receiving multiple wireless transmissions simultaneously.

[0178] Memory 1330 may include RAM, ROM, or a combination thereof. Memory 1330 may store computer-readable code 1335, which includes instructions that, when executed by a processor (e.g., processor 1340), cause the device to perform various functions described herein. In some cases, memory 1330 may include BIOS, etc., which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0179] The processor 1340 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, the processor 1340 may be configured to operate a memory array using a memory controller. In some cases, the memory controller may be integrated into the processor 1340. The processor 1340 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1330) to cause the device 1305 to perform various functions (e.g., functions or tasks supporting cross-carrier scheduling techniques for wireless communication systems).

[0180] The inter-site communication manager 1345 can manage communications with other base stations 105 and can include a controller or scheduler for controlling communications with the UE 115 in coordination with the other base stations 105. For example, the inter-site communication manager 1345 can coordinate the scheduling of transmissions to the UE 115 for various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-site communication manager 1345 can provide an X2 interface within an LTE / LTE-A wireless communication network technology to provide communications between the base stations 105.

[0181] The code 1335 may include instructions for implementing aspects of the present disclosure, including instructions for supporting wireless communications. The code 1335 may be stored in a non-transitory computer-readable medium such as system memory or other types of memory. In some cases, the code 1335 may not be directly executed by the processor 1340, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0182] Figure 14A flow chart illustrating a method 1400 for supporting cross-carrier scheduling techniques for a wireless communication system according to aspects of the present disclosure is shown. The operations of the method 1400 may be implemented by the UE 115 or components thereof, as described herein. For example, the operations of the method 1400 may be performed by a communication manager, as described with reference to FIG. Figures 6 to 9 In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the functions described below.

[0183] At 1405, the UE may identify that the UE is communicating with a primary cell and a secondary cell in a carrier aggregation configuration, wherein the primary cell is a cell scheduled across carriers and the secondary cell is a cell scheduled across carriers. The operations of 1405 may be performed according to the methods described herein. In some examples, aspects of the operations of 1405 may be as described with reference to Figures 6 to 9 The aggregation component is used to perform the above operations.

[0184] At 1410, the UE may receive downlink control information from the secondary cell, wherein the downlink control information includes a cross-carrier scheduling indication for scheduling data transmission with the primary cell. The operations of 1410 may be performed according to the methods described herein. In some examples, aspects of the operations of 1410 may be described with reference to Figures 6 to 9 The secondary cell component is used to perform the above operations.

[0185] At 1415, the UE may monitor the common search space of the primary cell for control information related to communications with the primary cell as a cross-carrier scheduled cell. The operations of 1415 may be performed according to the methods described herein. In some examples, aspects of the operations of 1415 may be described with reference to Figures 6 to 9 The primary cell component is used to execute.

[0186] At 1420, the UE may communicate with the primary cell via data transmission based on at least one of the downlink control information from the secondary cell and the control information from the common search space of the primary cell. The operations of 1420 may be performed according to the methods described herein. In some examples, aspects of the operations of 1420 may be described with reference to Figures 6 to 9 The data components are executed.

[0187] Figure 15 A flow chart illustrating a method 1500 for supporting cross-carrier scheduling techniques for a wireless communication system according to aspects of the present disclosure is shown. The operations of the method 1500 may be implemented by the UE 115 or a component thereof, as described herein. For example, the operations of the method 1500 may be performed by a communication manager, as described with reference to FIG. Figures 6 to 9In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the functions described below.

[0188] At 1505, the UE may identify that the UE is communicating with a primary cell and a secondary cell in a carrier aggregation configuration, wherein the primary cell is a cell scheduled across carriers and the secondary cell is a cell scheduled across carriers. The operations of 1505 may be performed according to the methods described herein. In some examples, aspects of the operations of 1505 may be as described with reference to Figures 6 to 9 The aggregation component is used to perform the above operations.

[0189] At 1510, the UE may identify a search space identifier associated with a user-specific search space of a secondary cell. The operations of 1510 may be performed according to the methods described herein. In some examples, aspects of the operations of 1510 may be as described with reference to Figures 6 to 9 The identifier component is executed.

[0190] At 1515, the UE may determine one or more configuration parameters associated with the user-specific search space of the primary cell based on the search space identifier. The operations of 1515 may be performed according to the methods described herein. In some examples, aspects of the operations of 1515 may be described with reference to Figures 6 to 9 The parameter component is executed.

[0191] At 1520, the UE may monitor the number of downlink control channel candidates of the user-specific search space of the secondary cell for downlink control information, wherein the number of downlink control channel candidates is based on one or more configuration parameters. The operations of 1520 may be performed according to the methods described herein. In some examples, aspects of the operations of 1520 may be described with reference to Figures 6 to 9 The monitoring component is used to perform the above operations.

[0192] At 1525, the UE may receive downlink control information from the secondary cell, wherein the downlink control information includes a cross-carrier scheduling indication for scheduling data transmission with the primary cell. The operations of 1525 may be performed according to the methods described herein. In some examples, aspects of the operations of 1525 may be described with reference to Figures 6 to 9 The secondary cell component is used to perform the above operations.

[0193] At 1530, the UE may monitor the common search space of the primary cell for control information related to communications with the primary cell as a cross-carrier scheduled cell. The operations of 1530 may be performed according to the methods described herein. In some examples, aspects of the operations of 1530 may be described with reference to Figures 6 to 9 The primary cell component is used to execute.

[0194] At 1535, the UE may communicate with the primary cell via data transmission based on at least one of the downlink control information from the secondary cell and the control information from the common search space of the primary cell. The operations of 1535 may be performed according to the methods described herein. In some examples, aspects of the operations of 1535 may be described with reference to Figures 6 to 9 The data components are executed.

[0195] Figure 16 A flow chart illustrating a method 1600 for supporting cross-carrier scheduling techniques for a wireless communication system according to aspects of the present disclosure is shown. The operations of the method 1600 may be implemented by the base station 105 or components thereof, as described herein. For example, the operations of the method 1600 may be performed by a communication manager, as described with reference to FIG. Figures 10 to 13 In some examples, the base station may execute a set of instructions to control functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the functions described below.

[0196] At 1605, the base station may identify that the UE is communicating with a primary cell and a secondary cell in a carrier aggregation configuration, wherein the primary cell is a cell scheduled across carriers and the secondary cell is a cell scheduled across carriers. The operations of 1605 may be performed according to the methods described herein. In some examples, aspects of the operations of 1605 may be as described with reference to Figures 10 to 13 The carrier aggregation component is used to perform the above operations.

[0197] At 1610, the base station may send control information related to communications with the primary cell on the common search space of the primary cell. The operations of 1610 may be performed according to the methods described herein. In some examples, aspects of the operations of 1610 may be as described with reference to Figures 10 to 13 The common search space component is used to perform the above operations.

[0198] At 1615, the base station may send downlink control information on the user-specific search space of the secondary cell, wherein the downlink control information includes a cross-carrier scheduling indication for scheduling data transmission with the primary cell. The operation of 1615 may be performed according to the method described herein. In some examples, aspects of the operation of 1615 may be as described in reference to Figures 10 to 13 The user-specific search space component is used to perform the search.

[0199] At 1620, the base station may communicate with the UE via data transmission of the primary cell based on at least one of the downlink control information and the control information regarding communication with the primary cell. The operations of 1620 may be performed according to the methods described herein. In some examples, aspects of the operations of 1620 may be described with reference to Figures 10 to 13 The data module is used to execute.

[0200] Figure 17 A flow chart illustrating a method 1700 for supporting cross-carrier scheduling techniques for a wireless communication system according to aspects of the present disclosure is shown. The operations of the method 1700 may be implemented by the base station 105 or components thereof, as described herein. For example, the operations of the method 1700 may be performed by a communication manager, as described with reference to FIG. Figures 10 to 13 In some examples, the base station may execute a set of instructions to control functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the functions described below.

[0201] At 1705, the base station may identify that the UE is communicating with a primary cell and a secondary cell in a carrier aggregation configuration, wherein the primary cell is a cell scheduled across carriers and the secondary cell is a cell scheduled across carriers. The operations of 1705 may be performed according to the methods described herein. In some examples, aspects of the operations of 1705 may be as described with reference to Figures 10 to 13 The carrier aggregation component is used to perform the above operations.

[0202] At 1710, the base station may configure a user-specific search space for the primary cell with a per-aggregation-level indication of the number of downlink control channel candidates to monitor. The operations of 1710 may be performed according to the methods described herein. In some examples, aspects of the operations of 1710 may be as described with reference to Figures 10 to 13 The user-specific search space component is used to perform the search.

[0203] At 1715, the base station may send a carrier indicator field for the primary cell, a carrier indicator field for the secondary cell, or both to the UE. The operations of 1715 may be performed according to the methods described herein. In some examples, aspects of the operations of 1715 may be described with reference to Figures 10 to 13 The CIF component is used to perform the

[0204] At 1720, the base station may send control information related to communications with the primary cell on the common search space of the primary cell. The operations of 1720 may be performed according to the methods described herein. In some examples, aspects of the operations of 1720 may be as described with reference to Figures 10 to 13 The common search space component is used to perform the above operations.

[0205] At 1725, the base station may send downlink control information on the user-specific search space of the secondary cell, wherein the downlink control information includes a cross-carrier scheduling indication for scheduling data transmission with the primary cell. The operations of 1725 may be performed according to the methods described herein. In some examples, aspects of the operations of 1725 may be as described in reference to Figures 10 to 13 The user-specific search space component is used to perform the search.

[0206] At 1730, the base station may communicate with the UE via data transmission of the primary cell based on at least one of the downlink control information and the control information regarding communication with the primary cell. The operations of 1730 may be performed according to the methods described herein. In some examples, aspects of the operations of 1730 may be described with reference to Figures 10 to 13 The data module is executed.

[0207] Described below are multiple examples of methods, systems, or apparatuses, including components for implementing the methods or implementing the apparatuses, non-transitory computer-readable media storing instructions executable by one or more processors for causing the one or more processors to implement the methods, and systems including one or more processors and a memory coupled to the one or more processors, the memory storing instructions executable by the one or more processors for causing the system or apparatus to implement the methods. It should be understood that these are only some examples of possible examples, and other examples will be apparent to those skilled in the art without departing from the scope of the present invention.

[0208] The following provides an overview of aspects of the present disclosure:

[0209] Aspect 1: A method for wireless communication at a UE, comprising: identifying that the UE communicates with a primary cell and a secondary cell in a carrier aggregation configuration, wherein the primary cell is a cell scheduled across carriers and the secondary cell is a cross-carrier scheduled cell; receiving downlink control information from the secondary cell, wherein the downlink control information includes a cross-carrier scheduling indication for scheduling data transmission with the primary cell; monitoring a common search space of the primary cell for control information related to communication with the primary cell as a cross-carrier scheduled cell; and communicating with the primary cell via data transmission based on at least one of the downlink control information from the secondary cell and the control information from the common search space of the primary cell.

[0210] Aspect 2: The method according to Aspect 1 also includes: identifying a search space identifier associated with a user-specific search space of a secondary cell; determining one or more configuration parameters associated with the user-specific search space of the primary cell based at least in part on the search space identifier; and monitoring the number of downlink control channel candidates in the user-specific search space of the secondary cell for downlink control information, wherein the number of downlink control channel candidates is based at least in part on one or more configuration parameters.

[0211] Aspect 3: The method according to aspect 1 or 2, wherein the one or more configuration parameters include a per-aggregation level indication of the number of downlink control channel candidates to be monitored.

[0212] Aspect 4: The method according to any one of aspects 1 to 3, wherein the search space identifier associated with the user-specific search space of the secondary cell and the search space identifier associated with the user-specific search space of the primary cell are the same.

[0213] Aspect 5: The method according to any one of aspects 1 to 4 further includes: monitoring a first number of downlink control channel candidates in the secondary cell for information associated with the secondary cell; and monitoring a second number of downlink control channel candidates in the secondary cell for information associated with the primary cell.

[0214] Aspect 6: The method according to Aspect 5 further includes: determining a first number of downlink control channel candidates based at least in part on a carrier indicator field corresponding to a secondary cell; and determining a second number of downlink control channel candidates based at least in part on a carrier indicator field corresponding to a primary cell, wherein the downlink control information includes both the carrier indicator field corresponding to the secondary cell and the carrier indicator field corresponding to the primary cell.

[0215] Aspect 7: The method according to any one of Aspects 1 to 6 further includes: identifying the number of search spaces monitored by the UE on the primary cell and the secondary cell, wherein the number of search spaces includes the common search space of the primary cell and the user-specific search space of the secondary cell; and determining whether the number of search spaces is less than or equal to the maximum number of search spaces that the UE is configured to monitor for each bandwidth part.

[0216] Aspect 8: The method according to aspect 7, wherein the number of search spaces includes a user-specific search space of a primary cell.

[0217] Aspect 9: The method according to aspect 7, wherein the number of search spaces does not include a user-specific search space of a primary cell in the number of search spaces.

[0218] Aspect 10: The method according to any one of aspects 1 to 9, further comprising: monitoring one or more downlink control channel candidates of a user-specific search space of a secondary cell for downlink control information.

[0219] Aspect 11: The method according to any one of Aspects 1 to 10 further includes: identifying a cell radio network temporary identifier; monitoring a common search space of a primary cell for control information using the cell radio network temporary identifier; and monitoring a user-specific search space of a secondary cell using the cell radio network temporary identifier, wherein receiving downlink control information from the secondary cell is at least partially based on monitoring the user-specific search space of the secondary cell.

[0220] Aspect 12: A method according to any one of Aspects 1 to 11, wherein monitoring the common search space of the primary cell for control information related to communication with the primary cell includes: monitoring the type 0 common search space of the primary cell, the type 0A common search space of the primary cell, the type 1 common search space of the primary cell, the type 2 common search space of the primary cell, the type 3 common search space of the primary cell, or any combination thereof.

[0221] Aspect 13: The method according to any one of aspects 1 to 12, further comprising: performing one or more connectivity operations or mobility operations based at least in part on control information related to communication with the primary cell.

[0222] Aspect 14: The method according to any one of aspects 1 to 13, wherein communicating with the primary cell via the data transmission comprises: receiving downlink data transmission of the primary cell, sending uplink data transmission of the primary cell, or both.

[0223] Aspect 15: An apparatus comprising at least one component for performing the method of any one of aspects 1 to 14.

[0224] Aspect 16: An apparatus for wireless communication, comprising a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of any one of aspects 1 to 14.

[0225] Aspect 17: A non-transitory computer-readable medium storing a code for wireless communication, the code comprising instructions executable by a processor to perform the method of any one of aspects 1 to 14.

[0226] Aspect 18: A method for wireless communication at a base station, comprising: identifying that a UE communicates with a primary cell and a secondary cell in a carrier aggregation configuration, wherein the primary cell is a cell scheduled across carriers and the secondary cell is a cross-carrier scheduled cell; sending control information related to communication with the primary cell on a common search space of the primary cell; sending downlink control information on a user-specific search space of the secondary cell, wherein the downlink control information includes a cross-carrier scheduling indication for scheduling data transmission with the primary cell; and communicating with the UE via data transmission of the primary cell based on at least one of the downlink control information and the control information regarding communication with the primary cell.

[0227] Aspect 19: A method according to Aspect 18, wherein the common search space of the primary cell includes the type 0 common search space of the primary cell, the type 0A common search space of the primary cell, the type 1 common search space of the primary cell, the type 2 common search space of the primary cell, the type 3 common search space of the primary cell, or any combination thereof.

[0228] Aspect 20: The method according to Aspect 18 or 19 further includes: configuring a user-specific search space of a primary cell with a per-aggregation level indication of the number of downlink control channel candidates to be monitored; and sending a carrier indicator field for the primary cell, a carrier indicator field for the secondary cell, or both to the UE.

[0229] Aspect 21: The method according to any one of aspects 18 to 20, further comprising: configuring the UE with a search space identifier of a user-specific search space of a primary cell and a search space identifier of a user-specific search space of a secondary cell.

[0230] Aspect 22: The method according to any one of aspects 18 to 21, wherein the search space identifier of the user-specific search space of the primary cell is the same as the search space identifier of the user-specific search space of the secondary cell.

[0231] Aspect 23: The method according to any one of Aspects 18 to 22 further includes: receiving an indication of the capabilities of the UE; and configuring the UE to monitor a number of search spaces that meets a threshold number of search spaces for the UE to monitor in each bandwidth portion based at least in part on the capabilities of the UE, wherein the number of search spaces includes a common search space of the primary cell and a user-specific search space of the secondary cell.

[0232] Aspect 24: The method according to Aspect 23, wherein the number of search spaces includes a user-specific search space of a primary cell.

[0233] Aspect 25: The method according to Aspect 23, wherein the number of search spaces does not include a user-specific search space of a primary cell.

[0234] Aspect 26: An apparatus comprising at least one means for performing the method of any one of aspects 18 to 25.

[0235] Aspect 27: An apparatus for wireless communication, comprising a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of any one of aspects 18 to 25.

[0236] Aspect 28: A non-transitory computer-readable medium storing a code for wireless communication, the code comprising instructions executable by a processor to perform the method of any one of aspects 18 to 25.

[0237] It should be noted that the methods described herein describe possible implementations, and that the operations and steps may be rearranged or otherwise modified, and that other implementations are possible. Additionally, aspects from two or more methods may be combined.

[0238] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes, and the terminology of LTE, LTE-A, LTE-A Pro, or NR may be used in most of the description, the techniques described herein are applicable to applications beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques are applicable to various other wireless communication systems, such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0239] The information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0240] The various illustrative blocks and components described in conjunction with the disclosure herein may be implemented or executed using a general-purpose processor, a DSP, an ASIC, a CPU, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in combination with a DSP core, or any other such configuration.

[0241] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over a computer-readable medium as one or more instructions or code. Other examples and implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination thereof. Features that implement the functions may also be physically located in various locations, including being distributed so that portions of the functions are implemented in different physical locations.

[0242] Computer readable medium includes both non-transitory computer storage medium and communication medium, and computer storage medium and communication medium include any medium that helps to transfer a computer program from one place to another.Non-transitory storage medium can be any available medium that can be accessed by a general or special-purpose computer.As an example and not limitation, non-transitory computer readable medium can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disc (CD) ROM or other optical disc storage, disk storage or other magnetic storage device or can be used for carrying or storing required program code mode in the form of instruction or data structure and can be accessed by a general or special-purpose computer or a general or special-purpose processor.In addition, any connection is appropriately referred to as computer readable medium.For example, if coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technology (such as infrared, radio and microwave) are used to send software from a website, server or other remote source, coaxial cable, fiber optic cable, twisted pair, DSL or wireless technology (such as infrared, radio and microwave) are included in the definition of computer readable medium. Disk and disc, as used herein, include CDs, laser discs, optical discs, digital versatile discs (DVDs), floppy disks, and Blu-ray discs where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0243] As used herein, including in the claims, "or" as used in a list of items (e.g., a list of items preceded by a phrase such as "at least one" or "one or more"), indicates an inclusive list, so that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Furthermore, as used herein, the phrase "based on" should not be interpreted as a reference to a closed set of conditions. For example, an example step described as "based on condition A" could be based on both condition A and condition B without departing from the scope of this disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0244] In the drawings, similar components or features may have the same reference label. In addition, components of the same type may be distinguished by following the reference label with a dash and a second label that distinguishes between similar components. If only the first reference label is used in the specification, the specification applies to any similar component having the same first reference label, regardless of the second or subsequent reference labels.

[0245] The description set forth herein in conjunction with the accompanying drawings describes example configurations and does not represent all examples that may be implemented or within the scope of the claims. The term "example" as used herein means "serving as an example, instance, or illustration," rather than "preferred" or "superior to other examples." The detailed description includes specific details for the purpose of providing an understanding of the described technology. However, these technologies can be practiced without these specific details. In some cases, to avoid obscuring the concepts of the described examples, known structures and devices are shown in block diagram form.

[0246] The description provided herein enables one of ordinary skill in the art to make or use the present disclosure. Various modifications to the present disclosure will be apparent to those of ordinary skill in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a user equipment UE, comprising: Identify that the UE communicates with a primary cell and a secondary cell in a carrier aggregation configuration, wherein the primary cell is a cell scheduled across carriers, and the secondary cell is a cell scheduled across carriers; receiving downlink control information from the secondary cell, wherein the downlink control information includes a cross-carrier scheduling indication for scheduling data transmission with the primary cell; monitoring a common search space of the primary cell for control information related to communications of the primary cell as the cross-carrier scheduled cell; as well as and communicating with the primary cell via the data transmission based on at least one of the downlink control information from the secondary cell and the control information from the common search space of the primary cell.

2. The method according to claim 1, further comprising: identifying a search space identifier associated with a user-specific search space of the secondary cell; determining, based at least in part on a search space identifier, one or more configuration parameters associated with a user-specific search space of the primary cell; as well as A number of downlink control channel candidates of the user-specific search space of the secondary cell is monitored for the downlink control information, wherein the number of downlink control channel candidates is based at least in part on the one or more configuration parameters.

3. The method according to claim 2, wherein: The one or more configuration parameters include a per-aggregation level indication of a number of downlink control channel candidates to monitor.

4. The method according to claim 2, wherein: A search space identifier associated with the user-specific search space of the secondary cell is the same as a search space identifier associated with the user-specific search space of the primary cell.

5. The method according to claim 1, further comprising: monitoring a first number of downlink control channel candidates in the secondary cell for information associated with the secondary cell; as well as A second number of downlink control channel candidates in the secondary cell is monitored for information associated with the primary cell.

6. The method according to claim 5, further comprising: determining the first number of downlink control channel candidates based at least in part on a carrier indicator field corresponding to the secondary cell; as well as The second number of downlink control channel candidates is determined based at least in part on a carrier indicator field corresponding to the primary cell, wherein the downlink control information includes both a carrier indicator field corresponding to the secondary cell and a carrier indicator field corresponding to the primary cell.

7. The method according to claim 1, further comprising: identifying a number of search spaces monitored by the UE on the primary cell and the secondary cell, wherein the number of search spaces includes the common search space of the primary cell and a user-specific search space of the secondary cell; as well as A determination is made as to whether the number of search spaces is less than or equal to a maximum number of search spaces that the UE is configured to monitor per bandwidth part.

8. The method according to claim 7, wherein: The number of search spaces includes a user-specific search space of the primary cell.

9. The method according to claim 7, wherein: The number of search spaces does not include a user-specific search space of the primary cell.

10. The method according to claim 7, further comprising: One or more downlink control channel candidates of the user-specific search space of the secondary cell are monitored for the downlink control information.

11. The method according to claim 1, further comprising: identifying a cell radio network temporary identifier; monitoring the common search space of the primary cell for the control information using the cell radio network temporary identifier; as well as A user specific search space of the secondary cell is monitored using the cell radio network temporary identifier, wherein receiving the downlink control information from the secondary cell is based at least in part on monitoring the user specific search space of the secondary cell.

12. The method according to claim 1, wherein: Monitoring the common search space of the primary cell for the control information related to communications with the primary cell comprises: The method includes monitoring a type 0 common search space of the primary cell, a type 0A common search space of the primary cell, a type 1 common search space of the primary cell, a type 2 common search space of the primary cell, a type 3 common search space of the primary cell, or any combination thereof.

13. The method according to claim 1, further comprising: One or more connectivity operations or mobility operations are performed based at least in part on the control information related to communications with the primary cell.

14. The method according to claim 1, wherein: Communicating with the primary cell via the data transmission includes: receiving a downlink data transmission of the primary cell, sending an uplink data transmission of the primary cell, or both.

15. A method for wireless communication at a base station, comprising: Identify that a user equipment UE communicates with a primary cell and a secondary cell in a carrier aggregation configuration, wherein the primary cell is a cell scheduled across carriers, and the secondary cell is a cell scheduled across carriers; Sending control information related to communication with the primary cell on a common search space of the primary cell; Sending downlink control information on a user-specific search space of the secondary cell, wherein the downlink control information includes a cross-carrier scheduling indication for scheduling data transmission with the primary cell; and The UE is communicated with via the data transmission of the primary cell according to at least one of the downlink control information and the control information regarding communication with the primary cell.

16. The method according to claim 15, wherein: The common search space of the primary cell includes a type 0 common search space of the primary cell, a type 0A common search space of the primary cell, a type 1 common search space of the primary cell, a type 2 common search space of the primary cell, a type 3 common search space of the primary cell, or any combination thereof.

17. The method according to claim 15, further comprising: configuring a user-specific search space of the primary cell with a per-aggregation-level indication of a number of downlink control channel candidates to be monitored; as well as A carrier indicator field for the primary cell, a carrier indicator field for the secondary cell, or both are sent to the UE.

18. The method according to claim 15, further comprising: The UE is configured with a search space identifier of a user specific search space of the primary cell and a search space identifier of a user specific search space of the secondary cell.

19. The method according to claim 18, wherein: A search space identifier of the user specific search space of the primary cell is the same as a search space identifier of the user specific search space of the secondary cell.

20. The method of claim 15, further comprising: receiving an indication of capabilities of the UE; as well as The UE is configured to monitor a number of search spaces that meets a threshold number of search spaces monitored by the UE in each bandwidth portion based at least in part on the capability of the UE, wherein the number of search spaces includes the common search space of the primary cell and the user-specific search space of the secondary cell.

21. The method according to claim 20, wherein: The number of search spaces includes a user-specific search space of the primary cell.

22. The method according to claim 20, wherein: The number of search spaces does not include a user-specific search space of the primary cell.

23. An apparatus for wireless communication at a user equipment UE, comprising: processor, a memory coupled to the processor; as well as instructions stored in the memory and executable by the processor to cause the device to: Identify that the UE communicates with a primary cell and a secondary cell in a carrier aggregation configuration, wherein the primary cell is a cell scheduled across carriers, and the secondary cell is a cell scheduled across carriers; receiving downlink control information from the secondary cell, wherein the downlink control information includes a cross-carrier scheduling indication for scheduling data transmission with the primary cell; monitoring a common search space of the primary cell for control information related to communications of the primary cell as the cross-carrier scheduled cell; as well as and communicating with the primary cell via the data transmission based on at least one of the downlink control information from the secondary cell and the control information from the common search space of the primary cell.

24. The device according to claim 23, wherein: The instructions are further executable by the processor to cause the apparatus to: identifying a search space identifier associated with a user-specific search space of the secondary cell; determining, based at least in part on a search space identifier, one or more configuration parameters associated with a user-specific search space of the primary cell; as well as A number of downlink control channel candidates of the user-specific search space of the secondary cell is monitored for the downlink control information, wherein the number of downlink control channel candidates is based at least in part on the one or more configuration parameters.

25. The device according to claim 24, wherein: The one or more configuration parameters include a per-aggregation level indication of a number of downlink control channel candidates to monitor.

26. The device according to claim 24, wherein: A search space identifier associated with the user-specific search space of the secondary cell is the same as a search space identifier associated with the user-specific search space of the primary cell.

27. The device according to claim 23, wherein: The instructions are further executable by the processor to cause the apparatus to: monitoring a first number of downlink control channel candidates in the secondary cell for information associated with the secondary cell; and A second number of downlink control channel candidates in the secondary cell is monitored for information associated with the primary cell.

28. The device according to claim 27, wherein The instructions are further executable by the processor to cause the apparatus to: determining the first number of downlink control channel candidates based at least in part on a carrier indicator field corresponding to the secondary cell; as well as The second number of downlink control channel candidates is determined based at least in part on a carrier indicator field corresponding to the primary cell, wherein the downlink control information includes both a carrier indicator field corresponding to the secondary cell and a carrier indicator field corresponding to the primary cell.

29. The device according to claim 23, wherein: The instructions are further executable by the processor to cause the apparatus to: identifying a number of search spaces monitored by the UE on the primary cell and the secondary cell, wherein the number of search spaces includes the common search space of the primary cell and a user-specific search space of the secondary cell; as well as A determination is made as to whether the number of search spaces is less than or equal to a maximum number of search spaces that the UE is configured to monitor per bandwidth part.

30. The device according to claim 29, wherein: The number of search spaces includes a user-specific search space of the primary cell.

31. The device according to claim 29, wherein: The number of search spaces does not include a user-specific search space of the primary cell.

32. The device according to claim 29, wherein: The instructions are further executable by the processor to cause the apparatus to: One or more downlink control channel candidates of the user-specific search space of the secondary cell are monitored for the downlink control information.

33. The device according to claim 23, wherein: The instructions are further executable by the processor to cause the apparatus to: identifying a cell radio network temporary identifier; monitoring the common search space of the primary cell for the control information using the cell radio network temporary identifier; as well as A user specific search space of the secondary cell is monitored using the cell radio network temporary identifier, wherein receiving the downlink control information from the secondary cell is based at least in part on monitoring the user specific search space of the secondary cell.

34. The apparatus of claim 23, wherein: The instructions for monitoring the common search space of the primary cell for the control information related to communication with the primary cell as the cross-carrier scheduled cell are executable by the processor to cause the apparatus to: The method includes monitoring a type 0 common search space of the primary cell, a type 0A common search space of the primary cell, a type 1 common search space of the primary cell, a type 2 common search space of the primary cell, a type 3 common search space of the primary cell, or any combination thereof.

35. The apparatus of claim 23, wherein: The instructions are further executable by the processor to cause the apparatus to: One or more connectivity operations or mobility operations are performed based at least in part on the control information related to communications with the primary cell.

36. The apparatus of claim 23, wherein: The instructions for communicating with the primary cell via the data transmission are executable by the processor to cause the apparatus to: receiving a downlink data transmission of the primary cell, sending an uplink data transmission of the primary cell, or both.

37. An apparatus for wireless communication at a base station, comprising: processor, a memory coupled to the processor; as well as instructions stored in the memory and executable by the processor to cause the device to: Identify that a user equipment UE communicates with a primary cell and a secondary cell in a carrier aggregation configuration, wherein the primary cell is a cell scheduled across carriers, and the secondary cell is a cell scheduled across carriers; transmitting control information related to communication of the primary cell as the cross-carrier scheduled cell on a common search space of the primary cell; Sending downlink control information on a user-specific search space of the secondary cell, wherein the downlink control information includes a cross-carrier scheduling indication for scheduling data transmission with the primary cell; and The UE is communicated with via the data transmission of the primary cell according to at least one of the downlink control information and the control information regarding communication with the primary cell.

38. The device according to claim 37, wherein The common search space of the primary cell includes a type 0 common search space of the primary cell, a type 0A common search space of the primary cell, a type 1 common search space of the primary cell, a type 2 common search space of the primary cell, a type 3 common search space of the primary cell, or any combination thereof.

39. The device according to claim 37, wherein: The instructions are further executable by the processor to cause the apparatus to: configuring a user-specific search space of the primary cell with a per-aggregation-level indication of a number of downlink control channel candidates to be monitored; as well as A carrier indicator field for the primary cell, a carrier indicator field for the secondary cell, or both are sent to the UE.

40. The apparatus of claim 37, wherein: The instructions are further executable by the processor to cause the apparatus to: The UE is configured with a search space identifier of a user specific search space of the primary cell and a search space identifier of a user specific search space of the secondary cell.

41. The device according to claim 40, wherein A search space identifier of the user specific search space of the primary cell is the same as a search space identifier of the user specific search space of the secondary cell.

42. The apparatus of claim 37, wherein: The instructions are further executable by the processor to cause the apparatus to: receiving an indication of capabilities of the UE; as well as The UE is configured to monitor a number of search spaces that meets a threshold number of search spaces monitored by the UE in each bandwidth portion based at least in part on the capability of the UE, wherein the number of search spaces includes the common search space of the primary cell and the user-specific search space of the secondary cell.

43. The device according to claim 42, wherein: The number of search spaces includes a user-specific search space of the primary cell.

44. The device according to claim 42, wherein: The number of search spaces does not include a user-specific search space of the primary cell.

45. A computer-readable medium having a program code recorded thereon, wherein the program code can be executed by one or more processors of a user equipment (UE) to enable the processors to perform the method according to any one of claims 1 to 14.

46. ​​A computer-readable medium having program code recorded thereon, wherein the program code can be executed by one or more processors of a base station to enable the processors to perform the method according to any one of claims 15 to 22.

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