Techniques for control channel repetition across component carriers

Abstract

Methods, systems, and devices for wireless communication are described. A user equipment (UE) can receive, from a base station, a scheduling configuration for scheduling communications on a first component carrier, the scheduling configuration indicating at least a first downlink control channel candidate on a second component carrier, the first downlink control channel candidate being linked to a second downlink control channel candidate on one of the first component carrier or a third component carrier for control channel repetition. The UE can then receive, from the base station based on the scheduling configuration, at least one repetition of a control message in the first downlink control channel candidate or the second downlink control channel candidate, the control message scheduling communications between the base station and the UE on the first component carrier. The UE can then transmit or receive the communications with the base station on the first component carrier.

Description

[0001] Cross-referencing

[0002] This patent application claims the rights of the following applications: U.S. Provisional Patent Application No. 63 / 163,548, filed March 19, 2021, entitled “TECHNIQUES FOR CONTROL CHANNEL REPETITION ACROSS COMPONENTCARRIERS”, by KHOSHNEVISAN et al.; and U.S. Patent Application No. 17 / 558,358, filed December 21, 2021, entitled “TECHNIQUES FOR CONTROL CHANNEL REPETITION ACROSS COMPONENTCARRIERS”; each of the above applications is assigned to the assignee of this application. Technical Field

[0003] The following relates to wireless communication, including techniques for control channel repetition across component carriers. Background Technology

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, and broadcasting. These systems can 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 (e.g., Long Term Evolution (LTE) systems, improved LTE (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 can employ technologies such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal FDMA (OFDMA), or Discrete Fourier Transform Extended 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 also be referred to as User Equipment (UE)).

[0005] Some wireless communication systems enable the scheduling of communication within component carriers via control signaling within the same component carrier (e.g., "self-scheduling" or "intra-carrier scheduling") and / or via control signaling within different component carriers (e.g., "cross-carrier scheduling" or "inter-carrier scheduling"). The carrier indicator field (CIF) within the control signaling indicates whether the control signaling is scheduling communication within the same component carrier or across different component carriers. In some wireless communication systems, a single component carrier can be scheduled via control signaling received on multiple component carriers. That is, a "scheduled component carrier" can be scheduled via control signaling on multiple "scheduled component carriers." However, some wireless communication systems impose restrictions on cross-carrier scheduling, which may limit its effectiveness. Summary of the Invention

[0006] The described techniques relate to improved methods, systems, apparatuses, and devices for supporting control channel repetition across component carriers. In summary, aspects of this disclosure provide techniques for control channel repetition across multiple component carriers for cross-carrier scheduling. Specifically, the techniques described herein support techniques for “linking” control channel candidates (e.g., physical downlink control channel (PDCCH) candidates) across multiple scheduled component carriers for control channel repetition (e.g., PDCCH repetition), wherein multiple control channel candidates can be used to schedule communication within a scheduled component carrier. A user equipment (UE) can attempt to decode signals received within each PDCCH candidate in a search space set to determine whether a cyclic redundancy check (CRC) has been passed for any candidate. For example, the UE can receive a scheduling configuration indicating multiple PDCCH candidates for scheduling communication on a first component carrier (“scheduled component carrier”), wherein the multiple PDCCH candidates are linked for PDCCH repetition. For example, a first PDCCH candidate and a second PDCCH candidate can be located within a second component carrier and a third component carrier (“scheduled component carrier”), respectively. In other cases, at least one PDCCH candidate can be located within the first component carrier. Subsequently, the UE may receive one or more repetitions of control messages (e.g., repetitions of downlink control information (DCI)) within the PDCCH candidate for scheduling communication within the first component carrier. The UE that successfully decodes at least one decoding candidate in the decoding candidates of the link receives at least one repetition of the control message for cross-carrier scheduling.

[0007] A method for wireless communication at a UE is described. The method may include: receiving from a base station a scheduling configuration for scheduling communication on a first component carrier, the scheduling configuration indicating at least a first downlink control channel candidate on a second component carrier, the first downlink control channel candidate being linked to a second downlink control channel candidate on one of the first or third component carriers for control channel repetition; receiving from the base station, based on the scheduling configuration, at least one repetition of a control message from the first or second downlink control channel candidate, the control message scheduling communication between the base station and the UE on the first component carrier; and transmitting or receiving the communication with the base station on the first component carrier.

[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 may be executable by the processor to cause the apparatus to: receive from a base station a scheduling configuration for scheduling communication on a first component carrier, the scheduling configuration indicating at least a first downlink control channel candidate on a second component carrier, the first downlink control channel candidate being linked to a second downlink control channel candidate on one of the first or third component carriers for control channel repetition; receive from the base station, based on the scheduling configuration, at least one repetition of a control message from the first or second downlink control channel candidate, the control message scheduling communication between the base station and the UE on the first component carrier; and transmit or receive the communication with the base station on the first component carrier.

[0009] Another apparatus for wireless communication at a UE is described. The apparatus may include: unit for receiving from a base station a scheduling configuration for scheduling communication on a first component carrier, the scheduling configuration indicating at least a first downlink control channel candidate on a second component carrier, the first downlink control channel candidate being linked to a second downlink control channel candidate on one of the first or third component carriers for control channel repetition; unit for receiving from the base station at least one repetition of a control message from the first or second downlink control channel candidate based on the scheduling configuration, the control message scheduling communication between the base station and the UE on the first component carrier; and unit for transmitting or receiving the communication with the base station on the first component carrier.

[0010] A non-transitory computer-readable medium is described, storing code for wireless communication at a UE. The code may include instructions executable by a processor to: receive from a base station a scheduling configuration for scheduling communication on a first component carrier, the scheduling configuration indicating at least a first downlink control channel candidate on a second component carrier, the first downlink control channel candidate being linked to a second downlink control channel candidate on one of the first or third component carriers for control channel repetition; receive from the base station, based on the scheduling configuration, at least one repetition of a control message from the first or second downlink control channel candidate, the control message scheduling communication between the base station and the UE on the first component carrier; and transmit or receive the communication with the base station on the first component carrier.

[0011] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing: receiving, via the scheduling configuration, an indication of a first search space set associated with the first downlink control channel candidate and a second search space set associated with the second downlink control channel candidate; and monitoring the first search space set and the second search space set based on the indication of the first search space set and the second search space set, wherein receiving at least one repetition of the control message may be based on the monitoring.

[0012] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for receiving indications of a first subcarrier spacing (SCS) of the first component carrier and a second SCS of the second or third component carrier via the scheduling configuration, wherein the monitoring may be based on the indications of the first SCS and the second SCS.

[0013] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, the first SCS and the second SCS may be identical, and the methods, apparatuses, and nontransitory computer-readable media may also include operations, features, units, or instructions for receiving indications of periods associated with both the first search space set and the second search space set via the scheduling configuration, wherein the monitoring may be based on the periods.

[0014] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, the first SCS may differ from the second SCS, and the methods, apparatuses, and nontransitory computer-readable media may also include operations, features, units, or instructions for receiving indications of a first period associated with the first search space set and a second period associated with the second search space set via the scheduling configuration, wherein the first period may differ from the second period, and wherein the monitoring may be based on the first period, the second period, or both.

[0015] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, the first ratio between the first SCS and the second SCS may be the same as the second ratio between the first period and the second period.

[0016] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, the first search space set includes a first number of downlink control channel candidates, the first number of downlink control channel candidates including the first downlink control channel candidates, and the second search space set includes a second number of downlink control channel candidates, the second number of downlink control channel candidates including the second downlink control channel candidates, and the first number and the second number may be the same.

[0017] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the first search space set and the second search space set may be associated with a public search space set index.

[0018] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for receiving an indication of a third search space set associated with the first component carrier via the scheduling configuration, the third search space set being associated with the common search space set index, wherein monitoring the first search space set and the second search space set may be based on the first search space set, the second search space set, and the third search space set being associated with the common search space set index.

[0019] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, receiving at least one repetition of the control message may include operations, features, units, or instructions for performing: receiving a first repetition of the control message in a first downlink control channel candidate; and receiving a second repetition of the control message in a second downlink control channel candidate, wherein sending or receiving the communication may be based on receiving the first repetition of the control message, the second repetition of the control message, or both.

[0020] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: executing a soft combination of a first signal corresponding to the first downlink control channel candidate and a second signal corresponding to the second downlink control channel candidate to decode the control message.

[0021] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for identifying one of the first downlink control channel candidate or the second downlink control channel candidate as a reference downlink control channel candidate.

[0022] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for receiving an indication of the reference downlink control channel candidate via the scheduling configuration, wherein identifying one of the first downlink control channel candidate or the second downlink control channel candidate as the reference downlink control channel candidate may be based on the scheduling configuration.

[0023] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the first downlink control channel candidate may be associated with a first search space set, and the second downlink control channel candidate may be associated with a second search space set. Furthermore, the methods, apparatuses, and non-transitory computer-readable media may include operations, features, units, or instructions for identifying one of the first downlink control channel candidates or the second downlink control channel candidate as the reference downlink control channel candidate based on one or more parameters associated with the first component carrier, the second component carrier, the third component carrier, or any combination thereof, including a component carrier index, an SCS, or both.

[0024] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: identifying one of the first downlink control channel candidates or the second downlink control channel candidate as the reference downlink control channel candidate based on which of the first downlink control channel candidate or the second downlink control channel candidate ends later in the time domain, which of the first downlink control channel candidate or the second downlink control channel candidate begins earlier in the time domain, based on the second downlink control channel candidate in the first component carrier, or any combination thereof.

[0025] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: transmitting the at least one repeated feedback message in response to the control message within a resource, which may be determined based on the reference downlink control channel candidate.

[0026] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for sending a feedback message having a payload size, which may be determined based on a downlink assignment index (DAI), wherein the DAI may be based on the reference downlink control channel candidate.

[0027] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, transmitting or receiving the communication may include operations, features, elements, or instructions for performing the following: transmitting or receiving the communication with the base station within a time slot that may be offset relative to the reference downlink control channel candidate.

[0028] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, transmitting or receiving the communication may include operations, features, elements, or instructions for transmitting or receiving the communication with the base station based on a beam, which may be determined based on the reference downlink control channel candidate.

[0029] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, sending or receiving the communication may include operations, features, units, or instructions for performing the following: sending or receiving the communication based on a preparation time associated with the communication, a channel state information (CSI) calculation time associated with the communication, or both, wherein the preparation time may be determined based on the reference downlink control channel candidate, and the CSI calculation time may be determined based on the reference downlink control channel candidate.

[0030] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the control messages include DCI messages.

[0031] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: sending or receiving the communication may be based on at least one repetition of the control message.

[0032] A method for wireless communication at a base station is described. The method may include: sending a scheduling configuration to a UE for scheduling communication on a first component carrier, the scheduling configuration indicating at least a first downlink control channel candidate on a second component carrier, the first downlink control channel candidate being linked to a second downlink control channel candidate on one of the first or third component carriers for control channel repetition; sending to the UE, based on the scheduling configuration, at least one repetition of a control message from the first or second downlink control channel candidate, the control message scheduling communication between the base station and the UE on the first component carrier; and sending or receiving the communication with the UE on the first component carrier.

[0033] 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 may be executable by the processor to cause the apparatus to: send to a UE a scheduling configuration for scheduling communication on a first component carrier, the scheduling configuration indicating at least a first downlink control channel candidate on a second component carrier, the first downlink control channel candidate being linked to a second downlink control channel candidate on one of the first or third component carriers for control channel repetition; send to the UE, based on the scheduling configuration, at least one repetition of a control message from the first or second downlink control channel candidate, the control message scheduling communication between the base station and the UE on the first component carrier; and send or receive the communication with the UE on the first component carrier.

[0034] Another apparatus for wireless communication at a base station is described. The apparatus may include: unit for transmitting to a UE a scheduling configuration for scheduling communication on a first component carrier, the scheduling configuration indicating at least a first downlink control channel candidate on a second component carrier, the first downlink control channel candidate being linked to a second downlink control channel candidate on one of the first or third component carriers for control channel repetition; unit for transmitting to the UE at least one repetition of a control message from the first or second downlink control channel candidate based on the scheduling configuration, the control message scheduling communication between the base station and the UE on the first component carrier; and unit for transmitting or receiving the communication with the UE on the first component carrier.

[0035] A non-transitory computer-readable medium is described, storing code for wireless communication at a base station. The code may include instructions executable by a processor to: send to a UE a scheduling configuration for scheduling communication on a first component carrier, the scheduling configuration indicating at least a first downlink control channel candidate on a second component carrier, the first downlink control channel candidate being linked to a second downlink control channel candidate on one of the first or third component carriers for control channel repetition; send to the UE, based on the scheduling configuration, at least one repetition of a control message from the first or second downlink control channel candidate, the control message scheduling communication between the base station and the UE on the first component carrier; and send or receive the communication with the UE on the first component carrier.

[0036] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: transmitting indications via the scheduling configuration to a first search space set associated with the first downlink control channel candidate and a second search space set associated with the second downlink control channel candidate, wherein the at least one repetition of transmitting the control message may be based on the first search space set, the second search space set, or both.

[0037] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for transmitting an indication of a first SCS for the first component carrier and a second SCS for the second or third component carrier via the scheduling configuration, wherein the at least one repetition of the control message may be based on the first SCS, the second SCS, or both.

[0038] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, the first SCS and the second SCS may be identical, and the methods, apparatuses, and nontransitory computer-readable media may also include operations, features, units, or instructions for performing the following: sending an indication of a period associated with both the first search space set and the second search space set via the scheduling configuration, wherein the at least one repetition of sending the control message may be based on the period.

[0039] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, the first SCS may differ from the second SCS, and the methods, apparatuses, and nontransitory computer-readable media may also include operations, features, units, or instructions for performing the following: sending indications via the scheduling configuration for a first period associated with the first search space set and a second period associated with the second search space set, wherein the first period may differ from the second period, and wherein the at least one repetition of sending the control message may be based on the first period, the second period, or both.

[0040] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, the first ratio between the first SCS and the second SCS may be the same as the second ratio between the first period and the second period.

[0041] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, the first search space set includes a first number of downlink control channel candidates, the first number of downlink control channel candidates including the first downlink control channel candidates, and the second search space set includes a second number of downlink control channel candidates, the second number of downlink control channel candidates including the second downlink control channel candidates, and the first number and the second number may be the same.

[0042] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the first search space set and the second search space set may be associated with a public search space set index.

[0043] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for transmitting an indication of a third search space set associated with the first component carrier via the scheduling configuration, the third search space set being associated with the common search space set index.

[0044] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the transmission of at least one repetition of the control message may include operations, features, units, or instructions for performing: transmitting a first repetition of the control message in a first downlink control channel candidate; and transmitting a second repetition of the control message in a second downlink control channel candidate, wherein transmitting or receiving the communication may be based on transmitting the first repetition of the control message, the second repetition of the control message, or both.

[0045] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for identifying one of the first downlink control channel candidate or the second downlink control channel candidate as a reference downlink control channel candidate.

[0046] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for sending an indication of the reference downlink control channel candidate via the scheduling configuration, wherein identifying one of the first downlink control channel candidate or the second downlink control channel candidate as the reference downlink control channel candidate may be based on the scheduling configuration.

[0047] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the first downlink control channel candidate may be associated with a first search space set, and the second downlink control channel candidate may be associated with a second search space set. Furthermore, the methods, apparatuses, and non-transitory computer-readable media may include operations, features, units, or instructions for identifying one of the first downlink control channel candidates or the second downlink control channel candidate as the reference downlink control channel candidate based on one or more parameters associated with the first component carrier, the second component carrier, the third component carrier, or any combination thereof, including a component carrier index, an SCS, or both.

[0048] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: identifying one of the first downlink control channel candidates or the second downlink control channel candidate as the reference downlink control channel candidate based on which of the first downlink control channel candidate or the second downlink control channel candidate ends later in the time domain, which of the first downlink control channel candidate or the second downlink control channel candidate begins earlier in the time domain, based on the second downlink control channel candidate in the first component carrier, or any combination thereof.

[0049] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: receiving, within a resource, at least one repeated feedback message in response to the control message, the resource being determined based on the reference downlink control channel candidate.

[0050] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for receiving a feedback message having a payload size, which may be determined based on a DAI, wherein the DAI may be based on the reference downlink control channel candidate.

[0051] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, transmitting or receiving the communication may include operations, features, elements, or instructions for performing the following: transmitting or receiving the communication with the UE within a time slot that may be offset relative to the reference downlink control channel candidate.

[0052] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, transmitting or receiving the communication may include operations, features, elements, or instructions for performing the following: transmitting or receiving the communication with the UE based on a beam, which may be determined based on the reference downlink control channel candidate.

[0053] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, sending or receiving the communication may include operations, features, units, or instructions for performing the following: sending or receiving the communication based on a preparation time associated with the communication, a CSI calculation time associated with the communication, or both, wherein the preparation time may be determined based on the reference downlink control channel candidate, and the CSI calculation time may be determined based on the reference downlink control channel candidate.

[0054] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the control messages include DCI messages.

[0055] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: sending or receiving the communication may be based on at least one repetition of the control message. Attached Figure Description

[0056] Figure 1 An example of a wireless communication system is shown that supports techniques for control channel repetition across component carriers according to various aspects of this disclosure.

[0057] Figure 2 An example of resource configuration supporting techniques for control channel repetition across component carriers, according to various aspects of this disclosure, is shown.

[0058] Figure 3 An example of resource configuration supporting techniques for control channel repetition across component carriers, according to various aspects of this disclosure, is shown.

[0059] Figure 4 An example of a wireless communication system is shown that supports techniques for control channel repetition across component carriers according to various aspects of this disclosure.

[0060] Figure 5 An example of resource configuration supporting techniques for control channel repetition across component carriers, according to various aspects of this disclosure, is shown.

[0061] Figure 6 An example of a process flow supporting techniques for control channel repetition across component carriers, based on various aspects of this disclosure, is shown.

[0062] Figure 7 and 8 A block diagram of an apparatus supporting techniques for control channel repetition across component carriers, according to various aspects of this disclosure, is shown.

[0063] Figure 9 A block diagram of a communication manager supporting techniques for control channel repetition across component carriers, according to various aspects of this disclosure, is shown.

[0064] Figure 10 A diagram of a system including a device for supporting control channel repetition across component carriers, according to various aspects of this disclosure, is shown.

[0065] Figure 11 and 12A block diagram of an apparatus supporting techniques for control channel repetition across component carriers, according to various aspects of this disclosure, is shown.

[0066] Figure 13 A block diagram of a communication manager supporting techniques for control channel repetition across component carriers, according to various aspects of this disclosure, is shown.

[0067] Figure 14 A diagram of a system including a device for supporting control channel repetition across component carriers, according to various aspects of this disclosure, is shown.

[0068] Figures 15 to 18 A flowchart illustrating a method for supporting control channel repetition across component carriers, according to various aspects of this disclosure, is shown. Detailed Implementation

[0069] Some wireless systems enable the scheduling of communication within a component carrier via control signaling within the same component carrier (e.g., "self-scheduling" or "intra-carrier scheduling") and / or via control signaling within different component carriers (e.g., "cross-carrier scheduling" and "inter-carrier scheduling"). The carrier indicator field (CIF) within the control signaling (e.g., a downlink control information (DCI) message) indicates whether the control signaling is scheduling communication within the same component carrier or between different component carriers. In some wireless communication systems, a single component carrier can be scheduled via control signaling received on multiple component carriers. That is, a "scheduled component carrier" can be scheduled via control signaling on multiple "scheduled component carriers." However, in these wireless communication systems, each individual communication on a scheduled component carrier can only be scheduled via control signaling on a single scheduled component carrier. Therefore, if the DCI message scheduling communication on a scheduled component carrier is corrupted or otherwise interfered with, the communication scheduled by the DCI may not be successfully scheduled or executed.

[0070] Therefore, aspects of this disclosure provide techniques for cross-carrier scheduling using control channel repetition (e.g., physical downlink control channel (PDCCH) repetition) across multiple component carriers. In particular, the techniques described herein support methods for “linking” PDCCH candidates across multiple scheduled component carriers for PDCCH repetition, wherein multiple PDCCH candidates can be used to schedule communication within the scheduled component carriers. A user equipment (UE) can attempt to decode the signal received within each PDCCH candidate in a search space set to determine whether a cyclic redundancy check (CRC) has been passed for any candidate.

[0071] For example, a UE may receive a scheduling configuration indicating multiple PDCCH candidates for scheduling communication on a first component carrier (“scheduled component carrier”), wherein the multiple PDCCH candidates are linked for PDCCH repetition. For example, the first PDCCH candidate and the second PDCCH candidate may be located within the second component carrier and the third component carrier (“scheduled component carrier”), respectively. In other cases, at least one PDCCH candidate may be located within the first component carrier. Subsequently, the UE may receive one or more repetitions of control messages (e.g., DCI repetitions) within the PDCCH candidates that schedule communication within the first component carrier (e.g., Physical Downlink Shared Channel (PDSCH) communication, Physical Uplink Shared Channel (PUSCH) communication). A UE that successfully decodes at least one of the linked decoding candidates receives at least one repetition of control messages for cross-carrier scheduling.

[0072] In some aspects, the scheduling configuration may indicate various parameters associated with scheduling communication on the first component carrier, including the search space set for the corresponding Physical Uplink Control Channel (PUCCH) candidates, the period of the corresponding search space set, the subcarrier spacing (SCS) of the search space set, etc. In some implementations, the UE may be configured to identify one of the PDCCH candidates as a "reference" PDCCH candidate (e.g., via the scheduling configuration, via predefined rules). The UE may then be configured to send feedback and / or determine the parameters for the scheduled communication based on the determined reference PDCCH candidate.

[0073] The various aspects of this disclosure are first described in the context of a wireless communication system. Additional aspects of this disclosure are described in the context of example resource configurations and example process flows. These aspects are further illustrated by apparatus diagrams, system diagrams, and flowcharts relating to techniques for control channel repetition across component carriers, and are described with reference to these diagrams.

[0074] Figure 1 Examples of a wireless communication system 100 supporting techniques for control channel repetition across component carriers, according to various aspects of this disclosure, are 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 improved LTE (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, or communication with low-cost and low-complexity devices, or any combination thereof.

[0075] Base stations 105 can be distributed throughout a geographical area to form a wireless communication system 100, and can be devices of different forms or with different capabilities. Base stations 105 and UE 115 can communicate wirelessly via one or more communication links 125. Each base station 105 can provide a coverage area 110, and UE 115 and base station 105 can establish one or more communication links 125 on the coverage area 110. Coverage area 110 can be an example of a geographical area where base station 105 and UE 115 can support signal transmission according to one or more radio access technologies.

[0076] UE 115 can be distributed throughout the entire coverage area 110 of the wireless communication system 100, and each UE 115 can be stationary, mobile, or both at different times. UE 115 can be devices of different forms or with different capabilities. Figure 1 Some example UE 115s are shown in the document. The UE 115 described herein is capable of communicating with various types of devices, such as other UE 115s, base station 105, or network devices (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network devices), such as... Figure 1 As shown.

[0077] Base station 105 can communicate with core network 130, communicate with each other, or perform both of these operations. For example, base station 105 can interface with core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). Base station 105 can communicate with each other directly (e.g., directly between base stations 105) on backhaul links 120 (e.g., via X2, Xn, or other interfaces), or indirectly (e.g., via core network 130), or perform both of these operations. In some examples, backhaul link 120 can be or includes one or more radio links.

[0078] One or more of the base stations 105 described herein may include, or may be referred to by those skilled in the art as, base station transceiver, radio base station, access point, radio transceiver, node B, evolved node B (eNB), next-generation node B or gigabit node B (any of which may be referred to as gNB), home node B, home evolved node B, or some other suitable term.

[0079] UE 115 may include or be referred to as a mobile device, wireless device, remote device, handheld device, or subscriber device, or some other suitable term, wherein "device" may also be referred to as a unit, station, terminal, or client, and other examples. UE 115 may also include or be referred to as a personal electronic device, such as a cellular phone, personal digital assistant (PDA), tablet computer, laptop computer, or personal computer. In some examples, UE 115 may include or be referred to as a wireless local loop (WLL) station, Internet of Things (IoT) device, Internet of Everything (IoE) device, or machine-type communication (MTC) device, and other examples, which may be implemented in various items such as appliances, vehicles, meters, and other examples.

[0080] The UE 115 described in this document can communicate with various types of devices, such as other UEs 115 that can sometimes act as repeaters, as well as base station 105 and network devices, including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, and other examples, such as... Figure 1 As shown.

[0081] UE 115 and base station 105 can wirelessly communicate with each other via one or more communication links 125 on one or more carriers. The term "carrier" can refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting communication link 125. For example, a carrier for communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth portion (BWP)) that operates 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 coordinating operation for the carrier, user data, or other signaling. Wireless communication system 100 can support communication with UE 115 using carrier aggregation or multi-carrier operation. Depending on the carrier aggregation configuration, UE 115 can be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation can be used in conjunction with both frequency division duplex (FDD) component carriers and time division duplex (TDD) component carriers.

[0082] In some examples (e.g., in a carrier aggregation configuration), the carrier may also have acquisition or control signaling that coordinates operation against other carriers. The carrier may be associated with a frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and may be positioned according to a channel grid for discovery by UE 115. The carrier may operate in standalone mode, where UE 115 performs initial acquisition and connection via the carrier, or the carrier may operate in non-standalone mode, where different carriers (e.g., the same or different radio access technologies) are used to anchor the connection.

[0083] The communication link 125 shown in the wireless communication system 100 may include uplink transmission from UE 115 to base station 105, or downlink transmission from base station 105 to UE 115. The carrier may carry downlink or uplink communication (e.g., in FDD mode) or may be configured to carry both downlink and uplink communication (e.g., in TDD mode).

[0084] A carrier can be associated with a specific bandwidth of the radio frequency spectrum, and in some examples, the carrier bandwidth can be referred to as the carrier or the “system bandwidth” of the wireless communication system 100. For example, the carrier bandwidth can be one of a number of defined bandwidths for a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz). 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 specific carrier bandwidth, or can be configured to support communication on one carrier bandwidth in 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 subband, BWP) or all of the carrier bandwidth.

[0085] The signal waveform transmitted on a carrier can consist of multiple subcarriers (e.g., using multicarrier modulation (MCM) techniques such as Orthogonal Frequency Division Multiplexing (OFDM) or Discrete Fourier Transform Spread Spectrum OFDM (DFT-S-OFDM)). In a system employing MCM, a resource element can include 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 can depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both). Therefore, the more resource elements UE 115 receives and the higher the order of the modulation scheme, the higher the data rate can be for UE 115. Wireless communication resources can refer to a combination of radio frequency spectrum resources, temporal resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers can further increase the data rate or data integrity used for communication with UE 115.

[0086] One or more digital schemes (numerologies) can be supported for a carrier, where the digital scheme may include a subcarrier spacing (Δf) and a cyclic prefix. A carrier can be divided into one or more BWPs with the same or different digital schemes. In some examples, UE 115 can be configured with multiple BWPs. In some examples, a single BWP for a carrier can be active at a given time, and communication for UE 115 can be restricted to one or more active BWPs.

[0087] It can be expressed in a basic unit of time (which can be, for example, T). s =1 / (Δf) max ·N f The sampling period is ) seconds, where Δf max This can represent the maximum supported subcarrier spacing, and N f The time interval for base station 105 or UE 115 can be represented as a multiple of the maximum supported Discrete Fourier Transform (DFT) size. The time interval for communication resources can be organized based on radio frames, each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame can be identified by a System Frame Number (SFN) (e.g., ranging from 0 to 1023).

[0088] Each frame may include multiple consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, a frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into a number 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 number of symbol periods (e.g., this depends on the length of the cyclic prefix added before each symbol period). In some wireless communication systems 100, time slots may be further divided into multiple micro-time slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., N) f (Number) sampling periods. The duration of a symbol period can depend on the subcarrier spacing or the operating frequency band.

[0089] A subframe, time slot, micro-time slot, or symbol can be the smallest scheduling unit of the wireless communication system 100 (e.g., in the time domain) and can be referred to as a transmission time interval (TTI). In some examples, the duration of the TTI (e.g., the number of symbol periods in the TTI) can be variable. Alternatively, the smallest scheduling unit of the wireless communication system 100 can be dynamically selected (e.g., in a burst form of a shortened TTI (sTTI)).

[0090] Physical channels can be multiplexed on a carrier using various techniques. For example, one or more of Time Division Multiplexing (TDM), Frequency Division Multiplexing (FDM), or hybrid TDM-FDM techniques can be used to multiplex physical control channels and physical data channels on a downlink carrier. A control region (e.g., a control resource set (CORESET)) for physical control channels can be defined by the number of symbol periods and can extend across the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (e.g., CORESETs) can be configured for a group of UEs 115. For example, one or more of the UEs 115 can monitor or search for control regions against control information based on one or more search space sets, and each search space set can include one or more control channel candidates arranged in a cascaded manner at one or more aggregation levels. The aggregation level for control channel candidates can refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with coded information for a control information format having a given payload size. The search space set may include a common search space set configured to send control information to multiple UEs 115 and a UE-specific search space set used to send control information to a specific UE 115.

[0091] In some examples, base station 105 may be mobile, and therefore provide communication coverage for mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. Wireless communication system 100 may include, for example, a heterogeneous network, in which different types of base stations 105 use the same or different radio access technologies to provide coverage for various geographic coverage areas 110.

[0092] Wireless communication system 100 can be configured to support ultra-reliable communication or low-latency communication, or various combinations thereof. For example, 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 mission-critical functions (e.g., mission-critical functions). Ultra-reliable communication can include private or group communication and can 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 can 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 are used interchangeably herein.

[0093] In some examples, UE 115 is able to communicate directly with other UE 115 on a device-to-device (D2D) communication link 135 (e.g., using peer-to-peer (P2P) or D2D protocols). One or more UE 115s utilizing D2D communication can be within the geographic coverage area 110 of base station 105. Other UE 115s in such a group may be outside the geographic coverage area 110 of base station 105 or otherwise unable to receive transmissions from base station 105. In some examples, groups of UE 115s communicating via D2D communication can utilize a one-to-many (1:M) system, where each UE 115 transmits to every 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 UE 115s without involving base station 105.

[0094] Core network 130 can provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. Core network 130 can be an evolved packet core (EPC) or a 5G core (5GC), and can include at least one control plane entity (e.g., a mobility management entity (MME), access and mobility management function unit (AMF)) managing access and mobility, and at least one user plane entity (e.g., a serving gateway (S-GW), packet data network (PDN) gateway (P-GW), or user plane function unit (UPF)) routing packets to or interconnecting with external networks. The control plane entity can manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management for UE 115 served by base station 105 associated with core network 130. User IP packets can be transmitted through the user plane entity, which can provide IP address allocation and other functions. The user plane entity can connect to IP service 150 for one or more network operators. IP services 150 may include access to the Internet, intranets, IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0095] Some network devices (e.g., base station 105) may include sub-components such as access network entity 140, which may be an example of an access node controller (ANC). Each access network entity 140 may communicate with UE 115 through one or more other access network transport entities 145 (which may be referred to as a radio headend, smart radio headend, or transmit / receive point (TRP)). 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 individual network devices (e.g., radio headends and ANCs) or incorporated into a single network device (e.g., base station 105).

[0096] Wireless communication system 100 can operate using one or more frequency bands (typically in the range of 300 MHz to 300 GHz). The region from 300 MHz to 3 GHz is often referred to as the Ultra High Frequency (UHF) region or decimeter band because the wavelength range extends from approximately one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features, but the waves can be sufficiently permeable to penetrate structures for use in macrocells to provide service to UE 115 located indoors. Compared to the transmission of smaller frequencies and longer waves in the lower 300 MHz portion of the spectrum in the High Frequency (HF) or Very High Frequency (VHF) regions, UHF wave transmission can be associated with smaller antennas and shorter distances (e.g., less than 100 km).

[0097] Wireless communication system 100 can utilize both licensed and unlicensed radio frequency spectrum bands. For example, wireless communication system 100 can employ licensed assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in unlicensed frequency bands (such as the 5 GHz Industrial, Scientific, and Medical (ISM) band). When operating in unlicensed radio frequency spectrum bands, devices (such as base station 105 and UE 115) can employ carrier sensing for collision detection and avoidance. In some examples, operation in unlicensed frequency bands can be based on carrier aggregation configurations that combine component carriers operating in licensed frequency bands (e.g., LAA). Operation in unlicensed spectrum can include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, and other examples.

[0098] Base station 105 or UE 115 may be equipped with multiple antennas, which can be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. The antennas of base station 105 or UE 115 may be located within one or more antenna arrays or antenna panels (which may support MIMO operation or transmit or receive beamforming). For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some examples, the antennas or antenna arrays associated with base station 105 may be located in different geographical locations. Base station 105 may have an antenna array having a number of rows and columns of antenna ports that base station 105 can use to support beamforming for communication with UE 115. Similarly, UE 115 may have one or more antenna arrays that can support various MIMO or beamforming operations. Additionally or alternatively, antenna panels may support radio frequency beamforming for signals transmitted via antenna ports.

[0099] Base station 105 or UE 115 can use MIMO communication to utilize multipath signal propagation and improve spectral efficiency by transmitting or receiving multiple signals via different spatial layers. Such a technique can be called spatial multiplexing. For example, a transmitting device can transmit multiple signals via different antennas or different combinations of antennas. Similarly, a receiving device can receive multiple signals via different antennas or different combinations of antennas. Each of the multiple signals can be referred to as a separate spatial stream and can carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers can be associated with different antenna ports used for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO) (where multiple spatial layers are transmitted to the same receiving device) and multi-user MIMO (MU-MIMO) (where multiple spatial layers are transmitted to multiple devices).

[0100] Beamforming (also known as spatial filtering, directional transmission, or directional reception) is a signal processing technique that can be used at a transmitting or receiving device (e.g., base station 105, UE 115) to form or guide an antenna beam (e.g., transmit beam, receive beam) along a spatial path between the transmitting and receiving devices. Beamforming can be achieved by combining signals transmitted via antenna elements of an antenna array such that some signals propagating relative to a specific orientation of the antenna array experience constructive interference, while others experience destructive interference. Adjustments to the signals transmitted via the antenna elements can include applying amplitude offset, phase offset, or both to the signals carried via the antenna elements associated with the transmitting or receiving device. The adjustments associated with each antenna element can be defined by a set of beamforming weights associated with a specific orientation (e.g., relative to the antenna array of the transmitting or receiving device, or relative to some other orientation).

[0101] As part of beamforming operations, base station 105 or UE 115 may use beam scanning techniques. For example, base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with UE 115. Base station 105 may transmit some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) multiple times in different directions. For example, base station 105 may transmit signals according to different sets of beamforming weights associated with different transmission directions. Transmissions in different beam directions may be used (e.g., by a transmitting device (such as base station 105) or by a receiving device (such as UE 115)) to identify the beam direction for subsequent transmissions or receptions performed by base station 105.

[0102] Base station 105 may transmit signals (e.g., data signals associated with a specific receiving device, such as UE 115) in a single beam direction (e.g., a direction associated with a particular receiving device, such as UE 115). In some examples, the beam direction associated with transmission along a single beam direction may be determined based on signals transmitted in one or more beam directions. For example, UE 115 may receive one or more signals transmitted by base station 105 in different directions and may report to base station 105 an indication of the signal received by UE 115 that has the highest signal quality or otherwise acceptable signal quality.

[0103] In some examples, multiple beam directions can be used to perform transmissions by a device (e.g., base station 105 or UE 115), and the device can use a combination of digital precoding or radio frequency beamforming to generate combined beams for (e.g., from base station 105 to UE 115) transmissions. UE 115 can report feedback indicating precoding weights for one or more beam directions, and this feedback can correspond to a configured number of beams spanning the system bandwidth or one or more subbands. Base station 105 can transmit reference signals that can be precoded or unprecoded (e.g., cell-specific reference signals (CRS), channel state information reference signals (CSI) reference signals (CSI-RS)). UE 115 can provide feedback on beam selection, which can be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., multi-panel type codebook, linear combination type codebook, port selection type codebook). Although these techniques are described with reference to signals transmitted by base station 105 in one or more directions, UE 115 may employ similar techniques to transmit signals multiple times in different directions (e.g., to identify beam directions for subsequent transmissions or receptions by UE 115) or to transmit signals in a single direction (e.g., to transmit data to a receiving device).

[0104] When receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from base station 105, the receiving device (e.g., UE 115) can attempt multiple receiving configurations (e.g., directional listening). For example, the receiving device can attempt multiple receiving directions by receiving via different antenna subarrays, by processing the received signals according to different antenna subarrays, by receiving according to different sets of receiving beamforming weights applied to signals received at multiple antenna elements of the antenna array (e.g., different sets of directional listening weights), or by processing the received signals according to different sets of receiving beamforming weights applied to signals received at multiple antenna elements of the antenna array (any of these operations can be referred to as "listening" according to different receiving configurations or receiving directions). In some examples, the receiving device can use a single receiving configuration to receive along a single beam direction (e.g., when receiving data signals). A single receiver configuration can be aligned to a beam direction determined based on listening in different receiver configuration directions (e.g., a beam direction determined to have the highest signal strength, highest signal-to-noise ratio (SNR), or otherwise acceptable signal quality based on listening in multiple beam directions).

[0105] The wireless communication system 100 can be a packet-based network operating according to a layered protocol stack. In the user plane, communication at the bearer or Packet Data Convergence Protocol (PDCP) layer can be IP-based. The Radio Link Control (RLC) layer can perform packet fragmentation and reassembly for transmission over logical channels. The Media Access Control (MAC) layer can perform priority handling and multiplexing of logical channels to transport channels. The MAC layer can also use error detection techniques, error correction techniques, or both to support retransmissions at 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 RRC connections (which support radio bearers for user plane data) between the UE 115 and the base station 105 or core network 130. At the physical layer, transport channels can be mapped to physical channels.

[0106] UE 115 and base station 105 can support data retransmission to increase the likelihood of successful data reception. Hybrid Automatic Repeat Request (HARQ) feedback is a technique used to increase the likelihood of correct data reception on communication link 125. HARQ can include a combination of error detection (e.g., using Cyclic Redundancy Check (CRC)), forward error correction (FEC), and retransmission (e.g., Automatic Repeat Request (ARQ)). HARQ can improve throughput at the MAC layer under poor radio conditions (e.g., low signal and noise conditions). In some examples, the device can support same-slot HARQ feedback, where the device can provide HARQ feedback for data received in a previous symbol within a specific time slot. In other cases, the device can provide HARQ feedback in subsequent time slots or according to some other time interval.

[0107] In some aspects, the UE 115 of the wireless communication system 100 may be configured with up to three CORESETs within a given BWP of the serving cell (e.g., within a given BWP of a component carrier). In some cases (e.g., version 16), the UE 115 may be configured with up to five CORESETs within the BWP of the serving cell. A CORESET may be associated with one or more Transport Configuration Indicator (TCI) states for PDCCH repetition and may be associated with the number of Resource Blocks (RBs) in the frequency domain and the number of symbols or other TTIs in the time domain (e.g., the number of OFDM symbols). Furthermore, each CORESET may be associated with an active TCI state. In some aspects, a CORESET configured at the UE 115 may be associated with the following: CCE Resource Element Group (CCE-REG) mapping type (e.g., CCE-REG bundle mapping type), precoding granularity, an identifier associated with scrambling for the PDCCH demodulation reference signal (DMRS) (e.g., scrambling identifier), coded bits of the DCI content, or any combination thereof.

[0108] In some aspects, UE 115 can be configured with up to ten search space sets within a given BWP of component carriers. In some aspects, each search space set can be associated with a CORESET and can include a set of monitoring opportunities. In some aspects, the search space set can include a set of control channel monitoring opportunities. For example, the search space set can include a set of monitoring opportunities where monitoring opportunities occur at regular or irregular intervals (e.g., one monitoring opportunity every 10 ms). UE 115 can be configured to perform blind decoding on signals received in the corresponding monitoring opportunity to determine whether a CRC has passed in the corresponding monitoring opportunity. Furthermore, UE 115 can be configured to determine control channel monitoring opportunities associated with a given search space set based on one or more characteristics of that search space set, which can be configured at UE 115 (e.g., pre-configured), indicated to UE 115 via base station 105 (e.g., via RRC signaling), or both. UE 115 can be configured with one or more different types of search space sets (e.g., searchSpaceType), including UE-specific search space sets, common search space sets, or both. In addition, each search space set can be associated with one or more DCI formats to be monitored.

[0109] The parameters of the search space set(s) can include the period (k) for monitoring opportunities. s (For example, k) s (time slots), and offsets for monitoring opportunities in units of time slots (e.g., o) s(e.g., monitoringSlotPeriodicityAndOffset), the duration indicating the number of time slots within the period in which the search space set exists (where T) s <k s (or any combination thereof). The UE 115 of the wireless communication system 100 can determine the time slot. and frame η f The number / quantity of PDCCH monitoring opportunities (e.g., PDCCH candidates) within the scope (if) (If so). In some aspects, when monitoring the control channel, UE 115 can be configured to monitor from the time slot. The beginning of T s Within consecutive time slots, control channel candidates (e.g., PDCCH candidates) are monitored for a search space set s, and this can avoid the following k... s -T s Control channel candidates are monitored for a search space set s within a consecutive time slot. The number of control channel candidates (e.g., PDCCH candidates) can be based on the aggregation level of wireless communications at UE 115 (e.g., number of CCEs).

[0110] These search space set parameters can be configured at UE 115 (e.g., pre-configured), indicated to UE 115 via base station 105 (e.g., via RRC signaling), or both. For example, RRC signaling can be used to configure parameters of the search space set at UE 115, including which CORESET the search space set is associated with, the period of the monitoring opportunity for the search space set, the offset of the monitoring opportunity, the DCI format to be monitored, and the number of PDCCH candidates for a given aggregation level of the search space set.

[0111] Each search space set can be associated with a search space set index. In some implementations, PDCCH candidates can be defined as part of the search space set configuration. For example, a search space set can include a set of PDCCH candidates, where each PDCCH candidate is associated with a given aggregation level and candidate index. In some aspects, UE 115 can be configured to monitor PDCCH candidates in a configured search space set. UE 115 can be configured to perform blind decoding of PDCCH candidates (e.g., monitoring opportunities) within the search space set. When UE 115 receives a DCI message within a PDCCH candidate, UE 115 can identify a CRC pass for UE 115 (e.g., successful decoding), and UE 115 can take action based on the received DCI message (e.g., perform communication scheduled by the DCI message).

[0112] In some aspects, UE 115 can be configured to monitor the control channel based on a control channel monitoring mode (e.g., PDCCH monitoring mode) within a time slot (e.g., monitoringSymbolsWithinSlot). For example, the PDCCH monitoring mode within a time slot can indicate the first symbol of the CORESET within the time slot used for PDCCH monitoring. For example, in the context of a time slot comprising fourteen symbols, the CORESET configured at UE 115 can be associated with a search space set comprising three symbols, and the control channel monitoring mode (e.g., monitoringSymbolsWithinSlot) associated with the search space set can be configured as "01000010001000". In this example, UE 115 can be configured to determine that three monitoring opportunities (e.g., PDCCH candidates) exist within each time slot where the search space set exists. Furthermore, UE 115 can be configured to determine that the three monitoring opportunities begin at the second, seventh, and eleventh symbols of each corresponding time slot where the search space exists.

[0113] In some aspects, multiple search space sets and / or multiple PDCCH candidates can be linked together (e.g., associated with each other) for possible repetitions of the same control channel transmission (e.g., DCI repetition). Linked PDCCH candidates can be used to send / receive repetitions of the same control message. In other words, PDCCH candidates can be linked together for “PDCCH repetition”. In the context of PDCCH repetition, the payload (e.g., DCI payload) received within two PDCCH candidates (e.g., two PDCCH repetitions) can be the same. For example, a first PDCCH candidate can be associated with or linked to a second PDCCH candidate. In this example, a first repetition of the DCI can be sent in the first PDCCH candidate, and a second repetition of the DCI can be sent in the second PDCCH candidate, where the first and second repetitions of the DCI are the same. In this example, UE 115 can receive and / or decode only the first repetition of the DCI or only decode the second repetition of the DCI. Alternatively or additionally, UE 115 can receive and / or decode both the first and second repetitions of the DCI by performing a soft combination of the first and second repetitions of the DCI, and the UE can be aware of the link before decoding. In some respects, related / linked PDCCH candidates can have the same level of aggregation (e.g., the same number of CCEs).

[0114] In some aspects, related PDCCH candidates in different search space sets associated with the corresponding CORESET can be linked together (e.g., correlated) for PDCCH repetition. In some cases, two PDCCH candidates with the same candidate index across two related search space sets can be linked or correlated. In other cases, PDCCH candidates with the same starting CCE index can be linked. Furthermore, UE 115 can be configured to have linked / correlated sets of PDCCH candidates within the same time slot or TTI (e.g., intra-slot PDCCH repetition), linked / correlated sets of PDCCH candidates in different time slots (e.g., intra-slot PDCCH repetition), or both.

[0115] The wireless communication system 100 can be configured to support inter-carrier scheduling (e.g., cross-carrier scheduling), intra-carrier scheduling (e.g., self-scheduling), or both. Inter-carrier scheduling or cross-carrier scheduling refers to the situation where control signaling transmitted / received on a first component carrier (e.g., the scheduling component carrier, the scheduling cell) is used to schedule communication (e.g., PDSCH, PUSCH) on different component carriers (e.g., the scheduled component carrier, the scheduled cell). Conversely, intra-carrier scheduling or self-scheduling refers to the situation where control signaling transmitted / received on a component carrier is used to schedule communication on the same component carrier (e.g., the same cell).

[0116] In some aspects, the search space set may include control channel candidates (e.g., PDCCH candidates) configured for self-scheduling, cross-carrier scheduling, or both. CCEs associated with control channel candidates (e.g., PDCCH candidates for self-scheduling, PDCCH candidates for cross-carrier scheduling) on ​​different scheduled component carriers within the monitoring opportunities of the search space set can be identified individually based on the number of candidates for each aggregation level. The number / quantity of candidates for each aggregation level can be configured in the scheduled component carriers and can be monitored in the scheduled component carriers. For example, the monitoring opportunities for the search space set include a set of PDCCH candidates with aggregation level two (e.g., two CCEs per PDCCH candidate). In this example, the set of PDCCH candidates may include a first subset of PDCCH candidates configured for self-scheduling (e.g., a subset of PDCCH candidates with CIF=0) and a second subset of PDCCH candidates configured for cross-carrier scheduling (e.g., a subset of PDCCH candidates with CIF=1). In this respect, a single search space set may include PDCCH candidates configured for self-scheduling, cross-carrier scheduling, or both.

[0117] In some wireless communication systems, a single scheduled component carrier can be scheduled without control signaling received on more than one scheduled component carrier. That is, some wireless communication systems enable scheduling of each scheduled component carrier via a single scheduled component carrier. In other wireless communication systems, a single component carrier can be scheduled via control signaling received on multiple component carriers. That is, scheduled component carriers can be scheduled via control signaling on multiple scheduled component carriers. Therefore, communication on both PCell / PCell and SCell can be used to schedule communication on PCell for DCI formats (e.g., DCI formats 0_1, 1_1, 0_2, 1_2). However, in some wireless communication systems, each individual communication on a scheduled component carrier can be scheduled via control signaling on only a single scheduled component carrier. In other words, a single PUSCH transmission on a scheduled component carrier can be scheduled without control signaling received on multiple scheduled component carriers. Therefore, if the DCI message used to schedule communication on a scheduled component carrier is corrupted or otherwise interfered with, the communication scheduled by DCI may not be successfully scheduled or executed.

[0118] Therefore, the UE 115 and base station 105 of the wireless communication system 100 can support techniques for control channel repetition (e.g., PDCCH repetition) across multiple component carriers for cross-carrier scheduling. Specifically, the techniques described herein support techniques for “linking” PDCCH candidates across multiple scheduling component carriers for PDCCH repetition, where multiple PDCCH candidates can be used to schedule communication within a scheduled component carrier. Thus, the techniques described herein enable scheduling of communication on a scheduled component carrier by repetition of control messages transmitted / received across multiple scheduling component carriers.

[0119] For example, UE 115 of wireless communication system 100 may receive a scheduling configuration indicating multiple PDCCH candidates for scheduling communication on a first component carrier (e.g., a scheduled component carrier), wherein the multiple PDCCH candidates are linked for PDCCH repetition. For example, the first PDCCH candidate and the second PDCCH candidate may be located in the second component carrier and the third component carrier (e.g., the scheduling component carrier), respectively. In other cases, at least one PDCCH candidate may be located in the first component carrier. In other words, in some cases, the first component carrier may be one of the scheduled component carrier and the scheduling component carrier. When configured to perform cross-carrier scheduling of scheduling component carriers (e.g., PCell, PSCell) via control channels on two or more scheduling component carriers (e.g., scheduling SCell (sSCell)), UE 115 can be configured to monitor control message transmissions on the scheduling component carriers (e.g., monitor DCI formats 0_1, 1_1, 0_2, 1_2), and schedule PDSCH / PUSCH communication on a UE-specific search space set of the scheduled component carriers (e.g., PCell, PSCell). Subsequently, UE 115 can receive one or more repetitions of control messages (e.g., DCI repetitions) within a PDCCH candidate, and the PDCCH candidate schedules communication within the first component carrier (e.g., PDSCH communication, PUSCH communication).

[0120] In some aspects, the scheduling configuration may indicate various parameters associated with scheduling communication on the first component carrier, including the search space set for the corresponding PUCCH candidate, the period of the corresponding search space set, the SCS of the search space set, etc. In some implementations, UE 115 may be configured to identify one of the PDCCH candidates as a "reference" PDCCH candidate (e.g., via the scheduling configuration, via predefined rules). UE 115 may then be configured to send feedback and / or determine parameters for the scheduled communication based on the determined reference PDCCH candidate.

[0121] The techniques described herein can provide improved cross-carrier scheduling. Specifically, the techniques described herein enable the use of PDCCH repetition within the context of cross-carrier scheduling, allowing for multiple PDCCH repetitions across multiple scheduling component carriers to schedule communication within the scheduled component carriers. By implementing PDCCH repetition within the context of cross-carrier scheduling, the techniques described herein improve the transmission diversity (e.g., frequency diversity, beam diversity) of control messages used for cross-carrier scheduling. Therefore, by improving transmission diversity and implementing multiple repetitions of control signaling to schedule communication on the scheduled component carriers, the techniques described herein improve the reliability of control signaling used for cross-carrier scheduling, enabling more efficient and wider use of cross-carrier scheduling.

[0122] Figure 2 An example of resource configuration 200 supporting techniques for control channel repetition across component carriers, according to various aspects of this disclosure, is shown. Aspects of resource configuration 200 may be implemented by or by wireless communication system 100.

[0123] As previously mentioned herein, multiple search space sets 205 can be linked together for control channel repetition (e.g., PDCCH repetition). For example, as shown in resource configuration 200, a first search space set 205-a can be linked to a second search space set 205-b. Specifically, monitoring opportunities 210 associated with the first search space set 205-a (e.g., monitoring opportunities 210-a, 210-b, 210-e, 210-f) can be linked with monitoring opportunities 210 associated with the second search space set 205-b (e.g., monitoring opportunities 210-c, 210-d, 210-g, 210-h). In some aspects, relevant PDCCH candidates in the corresponding search space set 205 associated with the corresponding CORESET (e.g., PDCCH candidates within monitoring opportunities 210 of the corresponding search space set 205) can be linked together (e.g., correlated) for PDCCH repetition.

[0124] In some cases, two PDCCH candidates with the same candidate index across two related search space sets 205 can be linked or related. In other cases, PDCCH candidates with the same starting CCE index can be linked. Furthermore, UE 115 can be configured with sets of linked / related PDCCH candidates within the same time slot or TTI (e.g., PDCCH repetition within the time slot), sets of linked / related PDCCH candidates within different time slots (e.g., PDCCH repetition within the time slot), or both.

[0125] Associations (e.g., links) between search space sets 205 and / or between PDCCH candidates can be configured (e.g., pre-configured) at UE 115, signaled to UE 115 by base station 105 (e.g., via RRC signaling), or both. For example, UE 115 can receive an RRC message indicating that a first PDCCH candidate in the first search space set 205-a is linked (e.g., correlated) with a second PDCCH candidate in the second search space set 205-b. As another example, UE 115 can receive an RRC message indicating that the first search space set 205-a is linked (e.g., correlated) with the second search space set 205-b for PDCCH repetition. In this example, PDCCH candidates with the same aggregation level and the same candidate index between the first and second search space sets 205 can be linked. Specifically, the first search space set 205-a and the second search space set 205-b may respectively include a first PDCCH candidate set (a first monitoring opportunity 210 set) and a second PDCCH candidate set (a second monitoring opportunity 210 set), wherein the first PDCCH candidate set is linked to the second PDCCH candidate set.

[0126] In some cases, the first and second sets of monitoring opportunities 210 may include the same number of monitoring opportunity / PDCCH candidates (e.g., a one-to-one mapping of monitoring opportunities 210). For example, monitoring opportunity 210-a associated with the first search space set 205-a may include the same number of PDCCH candidates as monitoring opportunity 210-c associated with the second search space set 205-b. Similarly, monitoring opportunities 210-b, 210-e, and 210-f associated with the first search space set may include the same number of PDCCH candidates as monitoring opportunities 210-d, 210-g, and 210-h associated with the second search space set 205-b, respectively. Furthermore, the first and second search space sets 205-a and 205-b may be configured with the same number of PDCCH candidates for each aggregation level.

[0127] In some aspects, aspects of resource configuration 200 can support techniques for control channel repetition (e.g., PDCCH repetition) across multiple component carriers for cross-carrier scheduling. In particular, aspects of resource configuration 200 can be used to "link" PDCCH candidates across multiple scheduled component carriers (e.g., across multiple search space sets 205) for PDCCH repetition, wherein multiple PDCCH candidates can be used to schedule communication within the scheduled component carriers.

[0128] Figure 3An example of resource configuration 300 supporting techniques for control channel repetition across component carriers, according to various aspects of this disclosure, is shown. Aspects of resource configuration 300 may be implemented by or in connection with wireless communication system 100, resource configuration 200, or both. Resource configuration 300 illustrates configurations for intra-carrier and inter-carrier (e.g., cross-carrier) scheduling.

[0129] In some aspects, certain wireless communication systems (e.g., wireless communication system 100) can be configured to support inter-carrier scheduling (e.g., cross-carrier scheduling), intra-carrier scheduling (e.g., self-scheduling), or both. Inter-carrier scheduling or cross-carrier scheduling refers to the situation where control signaling transmitted / received on a first component carrier (e.g., the scheduling component carrier, the scheduling cell) is used to schedule communication (e.g., PDSCH, PUSCH) on different component carriers (e.g., the scheduled component carrier, the scheduled cell). Conversely, intra-carrier scheduling or self-scheduling refers to the situation where control signaling transmitted / received on a component carrier is used to schedule communication on the same component carrier (e.g., the same cell).

[0130] For example, as shown in resource configuration 300, a scheduled component carrier 305-a can be associated with search space sets 310-a, 310-b, 310-c, and 310-d, which are configured to schedule communication on the scheduled component carrier 305-b. In this respect, the search space set 310 of the scheduled component carrier 305-a can be configured for cross-carrier scheduling on the scheduled component carrier 305-b.

[0131] In some implementations, search space sets 310 with the same search space set index (searchSpaceId) within scheduling component carrier 305-a (e.g., scheduling cell) and scheduled component carrier 305-b (e.g., scheduled cell) can be associated (e.g., linked). For example, a first search space set 310-a with a first search space set index (e.g., searchSpaceId = 1) on scheduling component carrier 305-a can be linked to a second search space set 310-e with a first search space set index (e.g., searchSpaceId = 1) on scheduled component carrier 305-b for cross-carrier scheduling. In particular, search space set 310 within scheduled component carrier 305-b can be linked to search space set 310 within scheduling component carrier 305-a, wherein the configuration of search space set 310 within scheduled component carrier 305-b can be used to determine the number of decoding candidates to be monitored within scheduling component carrier 305-a.

[0132] Therefore, the terms "linked," "linked," etc., can be used throughout this disclosure in two different contexts. First, related PDCCH candidates within different search space sets 310 can be referred to as "linked" for PDCCH repetition, in which case multiple repetitions of the same control message can be sent / received within the linked PDCCH candidates. Second, the search space set 310 within the scheduled component carrier 305 can be referred to as "linked" to the search space set 310 within the scheduled component carrier 305 for cross-carrier scheduling, in which case the configuration of the search space set 310 within the scheduled component carrier 305 can be used to determine the number of decoding candidates to be monitored within the search space set 310 of the scheduled component carrier 305.

[0133] In some respects, cross-carrier scheduling can only be performed if both the BWP associated with the link search space set 310 in the scheduled component carrier 305-a and the scheduled component carrier 305-b are active. In other words, and continuing with the example above, UE 115 can be configured to apply the search space set 310 in the scheduled component carrier 305-a to schedule the scheduled component carrier 305-b only if both the link search space set 310 in the scheduled component carrier 305-b and the scheduled component carrier 305-a are active downlink BWPs.

[0134] For example, UE 115 may be configured with a first search space set 310-a on a scheduled component carrier 305-a and a second search space set 310-e on a scheduled component carrier 305-b, wherein the first and second search space sets 310-a and 310-e are linked for cross-carrier scheduling. In this example, UE 115 may be configured to perform cross-carrier scheduling only when both the first BWP associated with the first search space set 310-a and the second BWP associated with the second search space set 310-e are active (e.g., applying the first search space set 310-a of the scheduled component carrier 305-a to the scheduled component carrier 305-b for cross-carrier scheduling). In some cases, the first and second BWPs of the search space sets 310-a and 310-e used for linking may be the same.

[0135] The search space set 310 of the scheduling component carrier 305-a can be additionally or alternatively configured for intra-carrier scheduling. Specifically, the search space set 310 may include control channel candidates (e.g., PDCCH candidates) configured for self-scheduling, cross-carrier scheduling, or both. For example, the first search space set 310-a may include a first set of control channel candidates 315-a, 315-c, 315-e (e.g., PDCCH candidates) configured for intra-carrier scheduling (e.g., self-scheduling) and a second set of control channel candidates 315-b, 315-d configured for cross-carrier scheduling. In this regard, control signaling executed on the first set of control channel candidates 315-a, 315-c, 315-e can be used to schedule communication on the scheduling component carrier 305-a, while control signaling executed on the second set of control channel candidates 315-b, 315-d can be used to schedule communication on the scheduled component carrier 305-b (e.g., within the search space set 310-e).

[0136] In some aspects, the CIF within control signaling (e.g., a DCI message) can indicate whether the control signaling is scheduled for communication on the same or different component carrier 305 on which it is transmitted / received. For example, a DCI with a CIF value of zero (e.g., CIF = 0) can indicate that the DCI is scheduled for communication on the same component carrier 305 on which it is transmitted / received. In this respect, a CIF value of zero can indicate self-scheduling. As another example, a DCI with a non-zero CIF value (e.g., CIF = 1, 2, etc.) can indicate that the DCI is scheduled for communication on a different component carrier 305 than on which it is transmitted / received. In this respect, a non-zero CIF value can indicate cross-carrier scheduling.

[0137] Furthermore, the corresponding control channel candidates 315 can be associated with corresponding CIF values ​​for intra-carrier and cross-carrier scheduling. For example, as shown in resource configuration 300, the first control channel candidate set 315-a, 315-c, 315-e can be associated with a first CIF value configured for intra-carrier scheduling (e.g., CIF = 0), and the second control channel candidate set 315-b, 315-d can be associated with a second CIF value configured for cross-carrier scheduling (e.g., CIF = 1). In some aspects, the CIF can be configured with 0 to 3 bits. In the case where the DCI includes a CIF configured with zero bits, the DCI can support only self-scheduling.

[0138] Within the monitoring opportunities of search space set 310, the CCEs associated with control channel candidates 315 for different scheduled component carriers 305 (e.g., a first set of control channel candidates 315-a, 315-c, 315-e for self-scheduled control channel candidates, and a second set of control channel candidates 315-b, 315-d for cross-carrier scheduling) can be identified individually based on the number of candidates for each aggregation level. The number of candidates for each aggregation level can be configured in scheduled component carrier 305-b and can be monitored in scheduled component carrier 305-a. For example, the first search space set 310-a may include monitoring opportunities that include control channel candidate sets 315 with aggregation level two (e.g., two CCEs for each control channel candidate 315). In this example, the control channel candidate set 315 may include a first subset of control channel candidates 315-a, 315-c, 315-e configured for self-scheduling (e.g., a subset of PDCCH candidates with CIF=0), and a second subset of control channel candidates 315-b, 315-d configured for cross-carrier scheduling (e.g., a subset of PDCCH candidates with CIF=1). In this regard, a single search space set 310 may include PDCCH candidates configured for self-scheduling, cross-carrier scheduling, or both. In some examples, time-domain behavior, monitoring opportunities, DCI formats to be monitored, or any combination thereof can be configured in the search space set 310 of the scheduled cell, and the number of candidates for each aggregation level can be configured in the search space set of the scheduled cell (e.g., a search space set with the same index). For example, Figure 3 The dashed arrows in the text indicate the association (link) between search space sets 310 that have the same search space set index in the scheduling cell and the scheduled cell (e.g., the link between the search space set 310-a of the scheduling component carrier 305-a and the search space set 310-e of the scheduled cell).

[0139] In some aspects, the scheduled component carrier 305-b (e.g., the scheduled cell) may not be configured with a CORESET, but may be configured with a search space set 310 (e.g., search space sets 310-e, 310-f, 310-g, 310-h). For the search space set 310 configured in the scheduled component carrier 305-b, fields associated with the search space set index (e.g., searchSpaceId) and the number of control channel candidates per aggregation level (e.g., nrofCandidates) can be configured. In contrast, other fields used for the search space set 310 configured in the scheduled component carrier 305-b may be absent or not configured, including fields associated with CORESET, fields associated with time-domain attributes (e.g., period, offset, duration, monitoring symbols per time slot), fields associated with the DCI format to be monitored, etc. In particular, these fields (except for the fields related to the number of control channel candidates for each aggregation level) can be defined as a search space set 310 (e.g., a search space set with the same index) for scheduling the corresponding scheduled component carrier 305-b and the scheduled component carrier 305-a.

[0140] In some aspects, the resource configuration 300 can support techniques for control channel repetition (e.g., PDCCH repetition) across multiple component carriers 305 for cross-carrier scheduling. Specifically, the resource configuration 300 can be used to “link” PDCCH candidates (e.g., control channel candidates 315) across multiple scheduled component carriers 305 (e.g., across multiple search space sets 310) for PDCCH repetition, wherein multiple PDCCH candidates can be used to schedule communication within a scheduled component carrier 305 (e.g., scheduled component carrier 305-b).

[0141] Figure 4 Examples of a wireless communication system 400 supporting techniques for control channel repetition across component carriers according to various aspects of this disclosure are shown. In some examples, the wireless communication system 400 may implement aspects of wireless communication system 100, resource configuration 200, resource configuration 300, or any combination thereof, or be implemented by aspects of wireless communication system 100, resource configuration 200, resource configuration 300, or any combination thereof. For example, the wireless communication system 400 may support control channel repetition for cross-carrier scheduling, such as... Figure 1-3 As described in [the text].

[0142] The wireless communication system 400 may include a base station 105-a and a UE 115-a, which may be referenced. Figure 1Examples of base station 105 and UE 115 are described. UE 115-a can communicate with base station 105-a using communication link 405, which can be an example of an NR or LTE link between UE 115-a and base station 105-a. In some cases, communication link 405 between UE 115-a and base station 105-a may include an example of an access link (e.g., a Uu link), which may include a bidirectional link enabling both uplink and downlink communication. For example, UE 115-a can use communication link 405 to send uplink signals (such as uplink control signals or uplink data signals) to base station 105-a, and base station 105-a can use communication link 405 to send downlink signals (such as downlink control signals or downlink data signals) to UE 115-a.

[0143] In some aspects, the UE 115-a and base station 105-a of the wireless communication system 400 can support techniques for control channel repetition (e.g., PDCCH repetition) across multiple component carriers for cross-carrier scheduling. Specifically, the techniques described herein support techniques for “linking” PDCCH candidates across multiple scheduling component carriers for PDCCH repetition, where multiple PDCCH candidates can be used to schedule communication within the scheduled component carriers. Therefore, the techniques described herein enable the scheduling of communication on scheduled component carriers by repetition of control messages transmitted / received across multiple scheduling component carriers.

[0144] In some cases, UE 115 can be configured with cross-carrier scheduling, such that two distinct scheduling component carriers are configured to schedule a single scheduled component carrier, and two search space sets on the two scheduling component carriers can be linked for PDCCH repetition to schedule PDSCH and / or PUSCH on the scheduled cell. One PDCCH candidate from the monitoring opportunities of the first search space set on the first scheduling component carrier can be linked with another PDCCH candidate from the monitoring opportunities of the second search space set on the second scheduling component carrier. DCI format 0_1 / 0_2 (e.g., for scheduling PUSCH or UL Type 2 CG version) or DCI format 1_1 / 1_2 (e.g., for scheduling PDSCH or semi-persistent scheduling (SPS) version) can be detected across the two scheduling component carriers in the linked PDCCH candidates. As described in some examples herein, the scheduled component carrier is the same as one of the two scheduling component carriers. For example, the two scheduling component carriers could be PCell and sSCell (scheduling SCell), and the scheduled cell is PCell. In other examples, the scheduled component carrier is a third component carrier that is different from the scheduled component carrier.

[0145] For example, UE 115-a can receive from base station 105-a a scheduling configuration 410 for scheduling communication 425 on a first component carrier 415 (e.g., scheduled component carrier 415). The scheduling configuration 410 can be transmitted via control signaling (including RRC messages, synchronization signal block (SSB) messages, DCI messages, or any combination thereof). In some aspects, the scheduling configuration 410 can indicate multiple downlink control channel candidates (e.g., PDCCH candidate 420) linked for control channel repetition, and can be used to schedule communication 425 on the first component carrier 415.

[0146] For example, a first scheduling configuration 410-a may indicate multiple PDCCH candidates 420, which are linked for control channel repetition, and these multiple PDCCH candidates 420 may be used to schedule communication 425 (e.g., communication 425-a) on a first component carrier 415-a (CC0). The first scheduling configuration 410-a may include a first PDCCH candidate 420-a on a second component carrier 415-b (CC1) (e.g., a scheduling component carrier 415-b), which is linked to a second PDCCH candidate 420-b on the first component carrier 415-a (CC0) for control channel repetition. In this example, the first component carrier 415-a (CC0) includes both the scheduled component carrier 415 and the scheduling component carrier 415. In other words, in the first scheduling configuration 410-a, the scheduled component carrier 415-a (CC0) includes PCell, and the two scheduled component carriers 415-a and 415-b (CC0, CC1) include PCell and sSCell, respectively.

[0147] As another example, the second scheduling configuration 410-b may indicate a plurality of PDCCH candidates 420, which are linked for control channel repetition, and the plurality of PDCCH candidates 420 may be used to schedule communication 425 (e.g., communication 425-b) on the scheduled component carrier 415-e (CC4). The second scheduling configuration 410-b may include a first PDCCH candidate 420-c (e.g., scheduled component carrier 415-d) on a second component carrier 415-d (CC3), which is linked for control channel repetition to a second PDCCH candidate 420-d (e.g., scheduled component carrier 415-c) on a third component carrier 415-c (CC2). In this example, component carriers 415-c, 415-d (CC2, CC3) include scheduled component carrier 415, and component carrier 415-e (CC4) includes scheduled component carrier 415.

[0148] The scheduling configuration 410 can indicate various parameters associated with scheduling communication 425 on the corresponding scheduling component carrier 415 (e.g., scheduled component carriers 415-a, 415-e), including the search space set for the corresponding PDCCH candidate 420, the period of the corresponding search space set, the SCS of the search space set, etc.

[0149] For example, a first scheduling configuration 410-a may include indications of a first search space set associated with a first PDCCH candidate 420-a and a second search space set associated with a second PDCCH candidate 420-b. The first and second PDCCH candidates 420-a and 420-b may be associated with monitoring opportunities (e.g., within monitoring opportunities) of the first and second search space sets, respectively. In this example, the first scheduling configuration 410-a may indicate that the first and second search space sets are linked for control channel repetition (e.g., PDCCH repetition) to schedule communication 425 on the scheduled component carrier 415-a (CC0). As another example, a second scheduling configuration 410-b may include indications of a first search space set associated with a first PDCCH candidate 420-c and a second search space set associated with a second PDCCH candidate 420-d. In this example, the second scheduling configuration 410-b may indicate that the first search space set and the second search space set are linked for control channel repetition (e.g., PDCCH repetition) to schedule communication 425 on the scheduled component carrier 415-e (CC4).

[0150] When scheduling configuration 410 indicates a search space set associated with the corresponding PDCCH candidate 420, scheduling configuration 410 may also indicate one or more parameters associated with the indicated search space set, including search space set index, period, number of PDCCH candidates 420 for each search space set, etc.

[0151] In some aspects, the first and second search space sets associated with the corresponding PDCCH candidates 420 may be associated with the same (e.g., common) search space set index. Furthermore, in some cases, the third search space set associated with the scheduled component carrier 415 may also be associated with the same (e.g., common) search space set index. For example, the second scheduling configuration 410-b may indicate that the first and second search space sets corresponding to the first and second PDCCH candidates 420-c and 420-d, respectively, are associated with the same search space set index and are therefore linked for control channel repetition. In some cases, the second scheduling configuration 410-b may also indicate that the third search space set associated with the scheduled component carrier 415-e (CC4) is associated with the same search space set index as the first and second search space set indexes. In this regard, UE 115-a may be configured to determine that the first and second search space sets are linked for control channel repetition based on the association of the corresponding search space sets with the same search space set index. Furthermore, UE 115-a can be configured to determine that the first, second, and third search space sets are linked for control channel repetition based on the fact that all of them are associated with the same search space set index. Control channel repetition is used to schedule communication 425 (e.g., communication 425-b) on the scheduled component carrier 415-e.

[0152] In some implementations, the first and second search space sets associated with the first and second PDCCH candidates 420, respectively, may include an equal number of monitoring opportunities and / or an equal number of PDCCH candidates 420. In other words, the first and second search space sets may represent a one-to-one mapping (e.g., a one-to-one link) between the PDCCH candidates 420. Specifically, the first and second search space sets may include an equal number of PDCCH candidates 420 corresponding to the scheduled component carriers 415-a, 415-e (e.g., scheduled component carriers 415) for each aggregation level. For example, referring to the first scheduling configuration 410-a, the first search space set may include a first number of PDCCH candidates 420, which includes the first PDCCH candidate 420-a. Similarly, the second search space set may include a second number of PDCCH candidates 420, which includes the second PDCCH candidate 420-b. In this example, the first number and the second number of downlink control channel candidates may be the same. In this respect, the first and second search space sets may include an equal number of PDCCH candidates 420 (e.g., an equal number of PDCCH candidates 420 on component carriers 415-a and 415-b). Similarly, referring to the second scheduling configuration 410-b, the search space sets on component carriers 415-c and 415-d may present an equal number of PDCCH candidates 420, including the first and second PDCCH candidates 420-c and 420-d.

[0153] In some implementations, scheduling configuration 410 may indicate the SCS associated with a corresponding component carrier 415 (e.g., the scheduled component carrier 415, the scheduling component carrier 415). For example, a second scheduling configuration 410-b may include indications of a first SCS associated with the scheduled component carrier 415-e, a second SCS associated with the scheduling component carrier 415-c, and a third SCS associated with the scheduling component carrier 415-d.

[0154] In some respects, the SCS of the corresponding scheduled component carriers 415 can be the same. For example, referring to the first scheduling configuration 410-a, the SCS of component carriers 415-a (CC0) and 415-b (CC1) can be the same. As another example, referring to the second scheduling configuration 410-b, the SCS of scheduled component carriers 415-c (CC2) and 415-d (CC3) can be the same (e.g., equal).

[0155] When the SCS of the scheduling component carriers 415 (e.g., scheduling component carriers 415-a and 415-b in the first scheduling configuration 410-a, and scheduling component carriers 415-c and 415-d in the second scheduling configuration 410-b) are equal, other parameters associated with the corresponding search space set can also be equal in order to maintain a one-to-one mapping / link between the PDCCH candidates 420 of the corresponding search space set.

[0156] Other parameters associated with the search space set may include the period, the number of PDCCH candidates 420, the number of monitoring opportunities, or any combination thereof. When the SCS of the scheduled component carriers 415 are the same, the period of the search space set for the corresponding scheduled component carriers 415 can also be the same, and the number of monitoring opportunities within a time slot can be the same for the search space set on the corresponding scheduled component carriers 415. Conversely, when the SCS of the scheduled component carriers 415 are different, the ratio of the period of the search space set for the corresponding scheduled component carriers 415 (in terms of the number of time slots) can be the same as the ratio of the SCS of the corresponding scheduled component carriers 415.

[0157] For example, when the SCS of the scheduled component carriers 415 are the same, the scheduling configuration 410 may also indicate the period associated with both the first and second search space sets, the number of monitoring opportunities per time slot associated with both the first and second search space sets, or both. In this respect, the scheduling configuration 410 may instruct the scheduled component carriers 415 to exhibit the same SCS, and also instruct the search space sets associated with the corresponding scheduled component carriers 415 to occur with the same period, the same number of monitoring opportunities per time slot, or both.

[0158] In additional or alternative implementations, the SCS of the corresponding scheduled component carriers 415 can be different. For example, referring to the first scheduling configuration 410-a, the SCS of scheduled component carriers 415-a and 415-b can be different. As another example, referring to the second scheduling configuration 410-b, scheduled component carriers 415-c and 415-d can exhibit different SCS.

[0159] When the SCS of the scheduled component carriers 415 are different, other parameters associated with the corresponding search space set (e.g., period, number of PDCCH candidates 420, number of monitoring opportunities) can be selectively configured to maintain a one-to-one mapping / link between the PDCCH candidates 420 of the corresponding search space set. In particular, when the SCS of the scheduled component carriers 415 are different, the ratio of the period of the corresponding search space set (in terms of the number of time slots) should be the same as the ratio of the corresponding SCS.

[0160] For example, referring to the second scheduling configuration 410-b, scheduling component carriers 415-d and 415-c can be associated with first and second search space sets, respectively. In this example, scheduling component carrier 415-d (CC3) can be associated with a first SCS, and scheduling component carrier 415-c (CC2) can be associated with a second SCS different from the first SCS. Furthermore, the first search space set of scheduling component carrier 415-d (CC3) can be associated with a first period, and the second search space set of scheduling component carrier 415-c (CC2) can be associated with a second period different from the first period. In this example, a first ratio between the first SCS and the second SCS can be the same as a second ratio between the first period and the second period. Configuring the SCS of the scheduling component carrier 415 and the period of the search space set 415 of the scheduling component carrier such that the ratio of the SCS equals the ratio of the periods ensures a one-to-one mapping (e.g., one-to-one link) between the PDCCH candidates 420 of the first and second search space sets.

[0161] In some aspects, the scheduled component carrier 415 (e.g., scheduled component carriers 415-a, 415-e) may not be configured with a CORESET, but may be configured with a search space set. For the search space set configured in the scheduled component carrier 415, fields associated with the search space set index (e.g., searchSpaceId) and the number of control channel candidates per aggregation level (e.g., nrofCandidates) can be configured. In contrast, other fields of the search space set configured in the scheduled component carrier 415 may be absent or not configured, including fields associated with the CORESET, fields associated with time-domain attributes (e.g., period, offset, duration, monitoring symbols per time slot), fields associated with the DCI format to be monitored, etc. Specifically, these fields (except for those associated with the number of control channel candidates for each aggregation level) can be used to define the search space set of the scheduled component carrier 415 for scheduling the corresponding scheduled component carrier 415.

[0162] In some aspects, UE 115-a, base station 105-a, or both can identify one of the downlink control channel candidates (e.g., PDCCH candidate 420) of the scheduled component carrier 415 as a reference downlink control channel candidate (e.g., reference PDCCH candidate 420). In this respect, UE 115-a and / or base station 105-a can identify one of the PDCCH candidates 420 linked for control channel repetition as a reference PDCCH candidate. For example, if UE 115-a is configured with a first scheduling configuration 410-a, UE 115-a and / or base station 105-a can identify one of the first or second PDCCH candidates 420a, 420b as the reference PDCCH candidate 420. In other cases where UE 115-a is configured with the second scheduling configuration 410-b, UE 115-a and / or base station 105-a can identify one of the first or second PDCCH candidates 420-c, 420-d as the reference PDCCH candidate 420. Therefore, UE 115-a and / or base station 105-a can identify one of the PDCCH candidates 420 as the reference PDCCH candidate based on the scheduling configuration 410.

[0163] In some aspects, scheduling configuration 410 may explicitly indicate which PDCCH candidate 420 is the reference PDCCH candidate. In other words, in some cases, scheduling configuration 410 may include an indication of the reference PDCCH candidate 420. In other cases, UE 115-a and / or base station 105-a may be configured to identify one of the PDCCH candidates 420 as the reference PDCCH candidate based on one or more parameters associated with scheduling component carrier 415, parameters associated with the corresponding search space set, parameters associated with PDCCH candidate 420, or any combination thereof. Parameters used to identify the reference PDCCH candidate 420 may include, but are not limited to, component carrier index, SCS associated with the corresponding component carrier 415, relative positioning of the PDCCH candidate 420 in the time domain, or any combination thereof.

[0164] For example, referring to the second scheduling configuration 410-b, the first PDCCH candidate 420-c may be associated with a first search space set, and the second PDCCH candidate 420-d may be associated with a second search space set. In this example, UE 115-a and / or base station 105-a may identify one of the first or second PDCCH candidates 420-a, 420-b as the reference PDCCH candidate 420 based on one or more parameters associated with the scheduled component carrier 415-c (CC2), the scheduled component carrier 415-d (CC3), the scheduled component carrier 415-e (CC4), or any combination thereof. In this regard, the reference PDCCH candidate 420 may be determined based on parameters associated with the scheduled component carriers 415-c, 415-d, and / or the scheduled component carrier 415-e. One or more parameters may include, but are not limited to, component carrier index, SCS, or both.

[0165] For example, UE 115-a and / or base station 105-a can be configured to identify PDCCH candidate 420 with a higher or lower component carrier index within the scheduled component carrier 415 as a reference downlink control channel candidate. For example, if the scheduled component carrier 415-d (CC2) of the second scheduling configuration 410-b is associated with a higher component carrier index compared to scheduled component carrier 415-c, then UE 115-a can be configured to identify the second PDCCH candidate 420-d as a reference PDCCH candidate 420.

[0166] In other cases, UE 115-a and / or base station 105-a can be configured to identify PDCCH candidate 420 with a higher or lower SCS within the scheduled component carrier 415 as a reference PDCCH candidate. For example, if the scheduled component carrier 415-b (CC1) of the first scheduling configuration 410-a is associated with a higher SCS compared to component carrier 415-a (CC0), then UE 115-a can be configured to identify the first PDCCH candidate 420-a as the reference PDCCH candidate 420.

[0167] When PDCCH candidate 420 is located within the scheduled component carrier 415, UE 115-a and / or base station 105-a can be configured to identify PDCCH candidate 420 within the scheduled component carrier 415 as reference PDCCH candidate 420. For example, in the first scheduling configuration 410-a, UE 115-a can be configured to identify the second PDCCH candidate 420-b as reference PDCCH candidate 420 based on the fact that the second PDCCH candidate 420-b is located within the scheduled component carrier 415-a (CC0). In such a case, PDCCH candidate 420 on PCell (e.g., the second PDCCH candidate 420-b on the scheduled component carrier 415-a) can be considered as a reference PDCCH candidate.

[0168] In other cases, UE 115-a and / or base station 105-a may identify a reference PDCCH candidate 420 based on the relative position of the respective PDCCH candidates 420 in the time domain. For example, UE 115-a and / or base station 105-a may be configured to identify one of the PDCCH candidates 420 as a reference PDCCH candidate based on which of the PDCCH candidates 420 ends later in the time domain, which of the PDCCH candidates 420 starts earlier in the time domain, or both. For example, in some cases, a PDCCH candidate 420 that ends later in the time domain (e.g., PDCCH candidates 420-b, 420-d) may be considered a reference PDCCH candidate 420. In other cases, a PDCCH candidate 420 that starts earlier in the time domain (e.g., PDCCH candidates 420-a, 420-c) may be considered a reference PDCCH candidate 420.

[0169] As will be discussed in further detail in this paper, the location of the reference PDCCH candidate 420 can be used to identify other parameters for communication 425 between UE115-a and base station 105-a, including resources for feedback information (e.g., HARQ-ACK resources), payload size of feedback message 435, offset of communication 425 for scheduling, beam of communication 425 for scheduling, preparation time of communication 425 for scheduling, CSI calculation time of communication 425 for scheduling, etc.

[0170] In some aspects, UE 115-a can monitor a search space set configured via scheduling configuration 410. UE 115-a can monitor the corresponding search space set for one or more repetitions of control messages 430, which schedule communication 425 on scheduled component carriers 415 (e.g., scheduled component carriers 415-a, 415-e). In particular, UE 115-a can monitor a search space set configured for control channel repetition to schedule communication 425 on scheduled component carriers 415. For example, if UE 115-a is configured with a first scheduling configuration 410-a, UE 115-a can monitor a first search space set associated with a first PDCCH candidate 420-a and a second search space set associated with a second PDCCH candidate 420-b. In this respect, UE 115-a can be configured to monitor the search space set based on receive scheduling configuration 410, identification of reference PDCCH candidate 420, or both.

[0171] UE 115-a can be configured to monitor a search space set based on (e.g., according to) one or more parameters associated with a corresponding search space set, parameters associated with a corresponding component carrier 415, or both. Parameters that UE 115-a can use when monitoring a search space set may include the SCS of the corresponding component carrier 415, the period associated with the corresponding search space set, the search space set index associated with the corresponding search space set, or any combination thereof.

[0172] For example, referring to the first scheduling configuration 410-a, the first and second PDCCH candidates 420-a and 420-b linked for control channel repetition can be associated with the first and second search space sets, respectively. The first and second search space sets can be associated with a first period, and the second search space set can be associated with a second period. The first and second periods can be the same or different, as previously described herein. In this example, UE 115-a can monitor the first and second search space sets based on the first and second periods. Furthermore, UE 115-a can monitor the first and second search space sets based on (e.g., according to) the SCS associated with the component carriers 415-b and 415-a corresponding to the respective search space sets.

[0173] In some implementations, UE 115-a can monitor the search space set for control message 430, which schedules communication 425 on the scheduled component carrier 415, based on associating the search space set associated with the scheduled component carrier 415 and the scheduling component carrier 415 with the same search space set index. In other words, UE 115-a can monitor the linked search space set based on associating the linked search space set of the scheduling component carrier 415 with the same search space set index as the search space set of the scheduled component carrier 415.

[0174] For example, referring to the second scheduling configuration 410-b, scheduling component carriers 415-c and 415-d can be associated with first and second search space sets, respectively, which are linked to control channel repetition for scheduling communication 425 on the scheduled component carrier 415-e. Furthermore, the scheduled component carrier 415-e can be associated with a third search space set. In this example, the first, second, and third search space sets can be associated with a common (e.g., the same) search space set index. Therefore, UE 115-a can be configured to monitor the first and second search space set indices based on the association of the first, second, and third search space indices across the scheduling component carrier 415 and the scheduled component carrier 415 with the common search space set index.

[0175] In some aspects, UE 115-a may receive a first repetition of control message 430-a from base station 105-a. In some aspects, control message 430-a may schedule communication 425 (e.g., communication 425-a, 425-b) between UE 115-a and base station 105-a on scheduled component carriers 415 (e.g., scheduled component carriers 415-a, 415-e). Communication 425 scheduled by control message 430-a may include PDSCH transmission, PUSCH transmission, or both. Therefore, control message 430-a may indicate SPS release and / or configured permission release (e.g., permission configured for uplink type 2) on scheduled component carriers 415. Control message 430-a may include DCI messages (e.g., DCI formats 0_1, 0_2, 1_1, and / or 1_2).

[0176] In some aspects, UE 115-a may receive a first repetition of control message 430-a within a first PDCCH candidate 420, which is linked for control channel repetition configured by scheduling configuration 410. For example, referring to the first scheduling configuration 410-a, UE 115-a may receive a first repetition of control message 430-a within the first PDCCH candidate 420-a. As another example, referring to the second scheduling configuration 410-b, UE 115-a may receive a first repetition of control message 430-a within the first PDCCH candidate 420-c. In this respect, UE 115-a may receive the first repetition of control message 430-a based on (e.g., according to) the received scheduling configuration 410. Alternatively or additionally, UE 115-a may receive the first repetition of control message 430-a based on identifying the reference PDCCH candidate 420, monitoring the search space set, or any combination thereof.

[0177] In some cases, UE 115-a may receive a second repetition of control message 430-b from base station 105-a. The second repetition of control message 430-b may schedule communication 425 (e.g., PDSCH / SPS release, PDSCH / configuration permission release) between UE 115-a and base station 105-a on the first component carrier 415 (e.g., scheduled component carrier 415). Specifically, the second repetition of control message 430-b may include the same data payload as the first repetition of control message 430-a, and may schedule the same communication 425 as the first repetition of control message 430-a. Control message 430-b may include DCI messages (e.g., DCI formats 0_1, 0_2, 1_1, and / or 1_2).

[0178] In this regard, PDCCH repetition across different search space sets (e.g., when different scheduled component carriers 415 are configured to schedule a single component carrier 415) can be used to schedule PUSCH and / or PDSCH communication on the scheduled component carrier 415, indicate SPS release and / or configured permission release (e.g., permission configured for uplink type 2) on the scheduled component carrier 415, or any combination thereof. Furthermore, PDCCH repetition across different component carriers 415 can improve PDCCH diversity (e.g., frequency diversity), thereby improving the reliability of wireless communication.

[0179] In some aspects, UE 115-a may receive a second repetition of control message 430-b within the second PDCCH candidate 420, which is linked for control channel repetition configured by scheduling configuration 410. For example, referring to the first scheduling configuration 410-a, UE 115-a may receive a second repetition of control message 430-b within the second PDCCH candidate 420-b. As another example, referring to the second scheduling configuration 410-b, UE 115-a may receive a second repetition of control message 430-b within the second PDCCH candidate 420-d.

[0180] In this regard, UE 115-a may receive a second repetition of control message 430-b based on (e.g., according to) the received scheduling configuration 410. Alternatively or additionally, UE 115-a may receive a second repetition of control message 430-b based on identifying reference PDCCH candidate 420, monitoring the search space set, receiving a first repetition of control message 430-a, or any combination thereof.

[0181] In some cases, UE 115-a may receive the first and second repetitions of control messages 430-a and 430-b. In other cases, UE 115-a may receive only one of the first or second repetitions of control messages 430-a and 430-b. For example, with reference to the second scheduling configuration 410-b, cross-reference may affect the performance of communication performed on the scheduling component carrier 415-d (CC3) associated with the first PDCCH candidate 420-c, but may not affect the performance of communication performed on the scheduling component carrier 415-c (CC2) associated with the second PDCCH candidate 420-d. Therefore, in this example, UE 115-a may not successfully receive the first repetition of control message 430-c, but may successfully receive the second repetition of control message 430-d.

[0182] Using PDCCH repetition to schedule communication 425 on scheduled component carrier 415 can improve transmission diversity (e.g., frequency diversity), which can increase the likelihood that UE 115-a will receive at least one repetition of control message 430. Furthermore, sending / receiving multiple repetitions of control message 430 across multiple scheduled component carriers 415 can improve beam diversity for sending / receiving the corresponding control message 430 repetitions, because the CORESET and TCI states can be configured individually for the respective scheduled component carrier 415. Therefore, the techniques described herein can improve beam and spatial diversity for control messages 430 (e.g., PDCCH messages, DCI messages) used to schedule communication 425 on scheduled component carrier 415 without requiring UE 115-a to support multiple beams within a single component carrier 415.

[0183] If UE 115-a receives only the first or second repetition of control message 430, UE 115-a may demodulate / decode the single repetition of the received control message 430. If UE 115-a receives both the first and second repetitions of control messages 430-a and 430-b, UE 115-a may demodulate / decode only one of the first or second repetitions of control messages 430-a and 430-b. Alternatively, UE 115-a may combine the first and second repetitions of control messages 430-a and 430-b.

[0184] For example, UE 115-a can perform soft combination of the first and second repetitions of control message 430-a (e.g., perform one or more soft combination procedures) to demodulate / decode the repetitions of control messages 430-a and 430-b. In particular, UE 115-a can perform soft combination of a first signal corresponding to the first PDCCH candidate 420 (e.g., the first repetition of control message 430-a) and a second signal corresponding to the second PDCCH candidate 420 (e.g., the second repetition of control message 430-b).

[0185] In some aspects, UE 115-a may send a feedback message 435 to base station 105-a. UE 115-a may send the feedback message 435 based on (e.g., in response to) receiving at least one repetition of control messages 430-a, 430-b. The feedback message 435 may include HARQ messages (e.g., ACK, NACK). In some aspects, UE 115-a may send the feedback message 435 based on receiving scheduling configuration 410, identifying reference PDCCH candidates 420, monitoring the search space set, receiving the first and / or second repetitions of control messages 430-a, 430-b, performing soft combination, or any combination thereof.

[0186] In some aspects, UE 115-a may determine one or more parameters / characteristics associated with feedback message 435 based on the identified reference PDCCH candidate 420. The parameters / characteristics of feedback message 435 that may be determined based on reference PDCCH candidate 420 may include, but are not limited to, the resources used to send feedback message 435, the payload size of feedback message 435, or any combination thereof.

[0187] For example, UE 115-a may determine the resources (e.g., resource set) for transmitting feedback message 435 based on the identified reference PDCCH candidate 420. Specifically, UE 115-a may determine the resources for transmitting feedback message 435 based on the starting CCE of reference PDCCH candidate 420. In other cases, UE 115-a may interpret the downlink assignment index (DAI) within the first and / or second repetitions of received control messages 430-a and 430-b based on reference PDCCH candidate 420. As another example, UE 115-a may determine the payload size of feedback message 435 based on the DAI, which is based on reference PDCCH candidate 420. Specifically, UE 115-a may interpret the DAI within received control message 430 (e.g., received DCI message) based on the monitoring opportunities of received control messages 430-a and 430-b.

[0188] UE 115-a can perform (e.g., send, receive) communications 425 (e.g., communications 425-a, 425-b) scheduled on scheduled component carriers 415 (e.g., scheduled component carriers 415-a, 415-e) by one or more repetitions of control messages 430-a, 430-b. For example, if scheduled communication 425 includes a PUSCH transmission, UE 115-a can send the scheduled PUSCH transmission to base station 105-a on scheduled component carrier 415. As another example, if scheduled communication 425 includes a PDSCH transmission, UE 115-a can receive the scheduled PDSCH transmission from base station 105-a on scheduled component carrier 415.

[0189] UE 115-a and base station 105-a can perform scheduled communication 425 based on transmit / receive scheduling configuration 410, identify reference PDCCH candidates 420, monitor and search space set, repeat of transmit / receive control messages 430-a and 430-b, perform soft combination, transmit / receive feedback message 435, or any combination thereof.

[0190] In some aspects, UE 115-a may determine one or more parameters / characteristics associated with the scheduled communication 425 based on the identified reference PDCCH candidate 420. The parameters / characteristics of the scheduled communication 425 that may be determined based on the reference PDCCH candidate 420 may include, but are not limited to, the offset (e.g., slot offset) for the scheduled communication 425, the beam for the scheduled communication 425, the preparation time for the scheduled communication 425, or any combination thereof.

[0191] For example, UE 115-a can transmit or receive scheduled communication 425 within a time slot offset relative to the identified reference PDCCH candidate 420. In this regard, UE 115-a can determine the time slot offset based on the reference PDCCH candidate 420, wherein the time slot offset is measured relative to a reference time slot that includes the reference PDCCH candidate 420. Specifically, UE 115-a can identify a reference time slot and / or the reference PDCCH candidate 420 to apply the time slot offset indicated in the control message 430 (e.g., a DCI message) to identify the time slot of the scheduled communication 425. For example, UE 115-a can determine the time slot of the reference PDCCH candidate 420 and apply the time slot offset indicated in the control message 430 to identify the time slot of a scheduled PDSCH transmission, a scheduled PUSCH transmission, a scheduled CSI-RS transmission, a scheduled probe reference signal (SRS) transmission, or any combination thereof. As another example, UE 115-a can determine the beam for transmitting / receiving scheduled transmissions based on reference PDCCH candidate 420, and can use the determined beam to perform scheduled communication 425. Specifically, UE 115-a can determine a scheduling offset based on reference PDCCH candidate 420, and can be configured to determine whether UE 115-a will use the default beam or a different indicated beam based on the scheduling offset. For example, if the determined scheduling offset is less than a threshold (e.g., timeDurationforQCL), UE 115-a can determine to use the default beam; otherwise, UE 115-a can determine to use the indicated beam.

[0192] As another example, UE 115-a can determine the preparation time and / or CSI calculation time (e.g., a timeline for PUSCH preparation or CSI calculation) associated with the scheduled communication 425 based on a reference PDCCH candidate 420. In this example, UE 115-a can then execute the scheduled communication 425 based on (e.g., according to) the determined preparation time and / or the determined CSI calculation time. In particular, a timeline (e.g., preparation time, CSI calculation time) for PUSCH preparation or CSI calculation can be specified (e.g., for N2 and Z OFDM symbols), and this timeline can begin after the last symbol of the reference PDCCH candidate 420 and / or after the last symbol of the received control message 430.

[0193] The techniques described herein can provide improved cross-carrier scheduling. Specifically, the techniques described herein enable the use of PDCCH repetition within the context of cross-carrier scheduling, allowing multiple PDCCH repetitions across multiple scheduling component carriers 415 to schedule communication within the scheduled component carriers 415. By implementing PDCCH repetition within the context of cross-carrier scheduling, the techniques described herein can improve the transmission diversity (e.g., frequency diversity, beam diversity) of the control messages 430 used for cross-carrier scheduling. Therefore, by improving transmission diversity and implementing multiple repetitions of control signaling to schedule communication 425 on the scheduled component carriers 415, the techniques described herein can improve the reliability of control signaling used for cross-carrier scheduling, enabling more efficient and wider use of cross-carrier scheduling.

[0194] Figure 5 An example of resource configuration 500 supporting techniques for control channel repetition across component carriers, according to various aspects of this disclosure, is shown.

[0195] Resource configuration 500 may include a first scheduled component carrier 505-a (e.g., a first scheduled cell), a second scheduled component carrier 505-b (e.g., a second scheduled cell), and a scheduled component carrier 506-c (e.g., a scheduled cell). The first scheduled component carrier 505-a may include search space sets 510-a, 510-b, and 510-c. The second scheduled component carrier 505-b may include search space sets 510-d, 510-e, 510-f, and 510-g. Furthermore, the scheduled component carrier 505-c may include search space sets 510-h and 510-i.

[0196] As mentioned earlier, the scheduled component carrier 505-c may not be configured with a CORESET, but it may be configured with search space sets 510-h and 510-i. For the search space sets 510-h and 510-i configured in the scheduled component carrier 505-c, fields associated with the search space set index (e.g., searchSpaceId) and the number of control channel candidates per aggregation level (e.g., nrofCandidates) can be configured. In contrast, other fields for the search space sets 510-h and 510-i configured in the scheduled component carrier 505-c may be absent or not configured, including fields associated with CORESET, fields associated with time-domain attributes (e.g., period, offset, duration, monitoring symbols per time slot), and fields associated with the DCI format to be monitored. In particular, these fields (except for the fields related to the number of control channel candidates for each aggregation level) can be defined as a search space set 510 for scheduling the corresponding scheduled component carriers 505-a and 505-b of the scheduled component carrier 505-c.

[0197] As shown in resource configuration 500, the search space set 510-h associated with the scheduled component carrier 505-c can be configured to have cross-carrier control channel repetition. That is, the search space set 510-h associated with the scheduled component carrier 505-c can be scheduled via control channel repetition via the search space set 510-a associated with the first scheduled component carrier 505-a and the search space set 510-d associated with the second scheduled component carrier 505-b. In this respect, search space sets 510-a and 510-d can be linked for control channel repetition to schedule communication on the scheduled component carrier 505-c (e.g., on the search space set 510-h on the scheduled component carrier 505-c). Accordingly, UE 115 can be configured to receive multiple repetitions of the same control message within the search space set 510-a of the first scheduling component carrier 505-a and the search space set 510-d of the second scheduling component carrier 505-b, wherein two repetitions of the control message are scheduled to communicate within the search space set 510-h of the scheduled component carrier 505-c.

[0198] In some aspects, search space sets 510-a and 510-d can be linked for control channel repetition based on their association with a common search space set index (e.g., searchSpaceId1). Furthermore, based on the association of search space set 510-h with the same search space set index (e.g., searchSpaceId 1) as search space sets 510-a and 510-d, the search space set 510-h of the scheduled component carrier 505-c can be configured with cross-carrier control channel repetition on search space sets 510-a and 510-d.

[0199] In contrast, the search space set 510-i of the scheduled component carrier 505-c can be configured for cross-carrier scheduling via signaling on the second scheduled component carrier 505-b, but scheduling can be performed without control channel repetition. That is, the search space set 510-g of the second scheduled component carrier 505-b can have the same index as search space set 510-i, but since search space set 510-i is not linked to an additional search space set 510 with the same index on the first scheduled component carrier 505-a (or any other component carrier 505), control channel repetition is not configured. The configuration for control channel repetition for scheduling communication on the scheduled component carrier 505-c can be configured as part of the search space set configuration of the scheduled component carriers 505-a and 505-b, as part of the search space set configuration of the scheduled component carrier 505-c, based on search space sets with the same index as explained above, or any combination thereof.

[0200] Figure 6 Examples of a process flow 600 supporting techniques for control channel repetition across component carriers according to various aspects of this disclosure are shown. In some examples, process flow 600 may implement aspects of wireless communication system 100, resource configuration 200, resource configuration 300, wireless communication system 400, resource configuration 500, or any combination thereof, or be implemented by aspects of wireless communication system 100, resource configuration 200, resource configuration 300, wireless communication system 400, resource configuration 500, or any combination thereof. For example, process flow 600 may show UE 115-b receiving a scheduling configuration for cross-carrier scheduling of a first component carrier, receiving at least one repetition of a control message according to the scheduling configuration, and performing communication scheduled by at least one repetition of the control message on the first component carrier, as shown in reference. Figure 1-5 Described.

[0201] In some cases, process flow 600 may include UE 115-b and base station 105-b, which may be examples of the corresponding devices described herein. Specifically, Figure 6 The UE 115-b and base station 105-b shown may include Figure 4 Examples of UE 115-a and base station 105-a are shown.

[0202] In some examples, the operations shown in process flow 600 can be performed by hardware (e.g., including circuits, processing blocks, logic components, and other components), code executed by a processor (e.g., software), or any combination thereof. Alternative examples are possible, in which some steps are performed in a different order than described or not at all. In some cases, steps may include additional features not mentioned below, or additional steps may be added.

[0203] At 605, UE 115-b can receive from base station 105-b a scheduling configuration for scheduling communication on a first component carrier (e.g., a scheduled component carrier). The scheduling configuration can be sent via control signaling (including RRC messages, SSB messages, DCI messages, MAC-CE messages, or any combination thereof).

[0204] In some aspects, the scheduling configuration may indicate multiple downlink control channel candidates (e.g., PDCCH candidates) linked for control channel repetition and may be used to schedule communication on a first component carrier. At least one of the control channel candidates may reside in a second component carrier (e.g., a scheduling component carrier) different from the first component carrier. In this respect, the scheduling configuration may indicate the configuration of control channel candidates within two or more scheduling component carriers, which may be used to schedule communication within the scheduled component carriers.

[0205] For example, a scheduling configuration might indicate a first downlink control channel candidate on a second component carrier (e.g., a scheduled component carrier), which is repeatedly linked to a second downlink control channel candidate on the first component carrier for control channel repetition. In this example, the first component carrier includes both the scheduled component carrier and the scheduling component carrier. As another example, a scheduling configuration might indicate a first downlink control channel candidate on a second component carrier (e.g., a first scheduled component carrier), which is repeatedly linked to a second downlink control channel candidate on a third component carrier (e.g., a second scheduled component carrier) for control channel repetition. In this example, both the second and third component carriers include the scheduled component carrier, and the first component carrier includes the scheduled component carrier.

[0206] The scheduling configuration can indicate various parameters associated with scheduling communication on the first component carrier, including the search space set for the corresponding downlink control channel candidate, the period of the corresponding search space set, the SCS of the search space set, etc. For example, in some cases, the scheduling configuration may include an indication of a first search space set associated with a first downlink control channel candidate and a second search space set associated with a second downlink control channel candidate. In this example, the scheduling configuration may indicate that the first and second search space sets are linked for control channel repetition (e.g., PDCCH repetition) to schedule communication on the first component carrier.

[0207] When the scheduling configuration indicates a search space set associated with a corresponding downlink control channel candidate, the scheduling configuration may also indicate one or more parameters associated with the indicated search space set, including the search space set index, period, number of downlink control channel candidates (e.g., PDCCH candidates), etc. In some aspects, the first and second search space sets associated with the first and second control channel candidates, respectively, may be associated with the same (e.g., common) search space set index. Furthermore, in some cases, the third search space set associated with the first component carrier (e.g., the scheduled component carrier) may also be associated with the same (e.g., common) search space set index.

[0208] For example, the scheduling configuration may instruct the first and second search space sets to be associated with the same search space set index and thus linked for control channel repetition. In some cases, the scheduling configuration may also instruct a third search space set associated with the first component carrier (e.g., the scheduled component carrier) to be associated with the same search space set index as the first and second search space sets. In this regard, UE 115-b may be configured to determine that the first and second search space sets are linked for control channel repetition based on the association of the respective search space sets with the same search space set index. Furthermore, UE 115-b may be configured to determine that the first and second search space sets are linked for control channel repetition based on the association of all the first, second, and third search space sets with the same search space set index, with control channel repetition used for scheduling communication on the first component carrier.

[0209] In some implementations, the first and second search space sets, respectively associated with the first and second downlink control channel candidates, may include an equal number of monitoring opportunities and / or an equal number of downlink control channel candidates. In other words, the first and second search space sets may represent a one-to-one mapping (e.g., a one-to-one link) between PDCCH candidates. Specifically, the first and second search space sets may include an equal number of downlink control channel candidates corresponding to a first component carrier (e.g., a scheduled component carrier) for each aggregation level. For example, the first search space set may include a first number of downlink control channel candidates (e.g., PDCCH candidates) that includes the first downlink control channel candidates. Similarly, the second search space set may include a second number of downlink control channel candidates that includes the second downlink control channel candidates. In this example, the first number and the second number of downlink control channel candidates may be the same. In this respect, the first and second search space sets may include an equal number of PDCCH candidates.

[0210] In some implementations, the scheduling configuration may indicate the SCS associated with the corresponding component carriers (e.g., a first component carrier, a second component carrier, and a third component carrier). For example, the scheduling configuration may include an indication of a first SCS associated with a first component carrier (e.g., a scheduled component carrier) and a second SCS associated with a second component carrier, a third component carrier, or both.

[0211] In some respects, the SCS of the corresponding scheduled component carriers can be the same. For example, when the first and second downlink control channel candidates are associated with the second and third component carriers, respectively (e.g., the second and third component carriers include the scheduled component carrier), the SCS of the second and third component carriers can be the same (e.g., equal). As another example, when the first and second downlink control channel candidates are associated with the second and first component carriers, respectively (e.g., the second component carrier includes the scheduled component carrier, and the first component carrier includes both the scheduled component carrier and the scheduled component carrier), the SCS of the second and first component carriers can be the same.

[0212] When the SCS of the scheduled component carriers are equal, other parameters associated with the corresponding search space sets (e.g., period, number of PDCCH candidates, number of monitoring opportunities) can also be equal to maintain a one-to-one mapping / link between the PDCCH candidates of the corresponding search space sets. For example, when the SCS of the scheduled component carriers are the same, the scheduling configuration may also indicate the period associated with both the first and second search space sets, the number of monitoring opportunities per slot associated with both the first and second search space sets, or both. In this respect, the scheduling configuration may indicate that the scheduled component carriers exhibit the same SCS, and also indicate that the search space sets associated with the corresponding scheduled component carriers exhibit the same period, the same number of monitoring opportunities per slot, or both.

[0213] In additional or alternative implementations, the SCS of the corresponding scheduled component carriers may differ. For example, when a first downlink control channel candidate and a second downlink control channel candidate are associated with a second component carrier and a third component carrier, respectively (e.g., the second and third component carriers include the scheduled component carrier), the second and third component carriers may exhibit different SCSs. As another example, when a first downlink control channel candidate and a second downlink control channel candidate are associated with a second component carrier and a first component carrier, respectively (e.g., the second component carrier includes the scheduled component carrier, and the first component carrier includes both the scheduled component carrier and the scheduled component carrier), the SCS of the second and first component carriers may differ.

[0214] At 610, UE 115-b, base station 105-b, or both can identify one of the downlink control channel candidates (e.g., PDCCH candidates) of the scheduled component carriers as a reference downlink control channel candidate (e.g., a reference PDCCH candidate). In this respect, UE 115-b and / or base station 105-b can identify one of the PDCCH candidates linked for control channel repetition as a reference downlink control channel candidate. UE 115-b, base station 105-b, or both can identify one of the downlink control channel candidates as a reference downlink control channel candidate at 610 based on the scheduling configuration received at 605.

[0215] In some aspects, the scheduling configuration may explicitly indicate which downlink control channel candidate is the reference downlink control channel candidate. In other words, in some cases, the scheduling configuration may include an indication of a reference downlink control channel candidate. In other cases, UE 115-b and / or base station 105-b may be configured to identify one of the downlink control channel candidates as the reference downlink control channel candidate based on one or more parameters associated with the scheduling component carrier, parameters associated with the corresponding search space set, parameters associated with the downlink control channel candidate, or any combination thereof. Parameters used to identify the reference downlink control channel candidate may include, but are not limited to, component carrier index, SCS associated with the corresponding component carrier, relative positioning of the downlink control channel candidate in the time domain, or any combination thereof.

[0216] As discussed earlier in this paper, the location of the reference PDCCH candidate can be used to identify other parameters for communication between UE 115-b and base station 105-b, including resources for feedback information (e.g., HARQ-ACK resources), payload size of feedback messages, offset for scheduled communication, beam for scheduled communication, preparation time for scheduled communication, CSI calculation time for scheduled communication, etc.

[0217] At 615, UE 115-b can monitor a search space set configured via a scheduling configuration. UE 115-b can monitor the corresponding search space set for one or more repetitions of control messages, which schedule communication on scheduled component carriers. Specifically, UE 115-b can monitor a search space set configured for control channel repetitions to schedule communication on scheduled component carriers. In this regard, UE 115-b can be configured to monitor the search space set based on receiving the scheduling configuration at 605, identifying reference PDCCH candidates at 610, or both.

[0218] UE 115-b can be configured to monitor a search space set based on (e.g., according to) one or more parameters associated with the corresponding search space set, parameters associated with the corresponding component carrier, or both. Parameters that UE 115-b can use when monitoring the search space set at 615 may include the SCS of the corresponding component carrier, the period associated with the corresponding search space set, the search space set index associated with the corresponding search space set, or any combination thereof.

[0219] For example, first and second PDCCH candidates linked for control channel repetition can be associated with first and second search space sets, respectively. The first and second search space sets can be associated with a first period, and the second search space set can be associated with a second period. The first and second periods can be the same or different, as previously described herein. In this example, UE 115-b can monitor the first and second search space sets based on the first and second periods. Furthermore, UE 115-b can monitor the first and second search space sets based on (e.g., according to) the SCS associated with the component carriers corresponding to the respective search space sets.

[0220] In some implementations, UE 115-b can monitor search space sets for control messages that schedule communication on the scheduled component carriers, based on the association of search space sets associated with the scheduled component carriers and the scheduling component carriers with the same search space set index. For example, first and second scheduled component carriers can be associated with first and second search space sets, respectively, and these sets are linked for control channel repetition to schedule communication on the scheduled component carriers. Furthermore, the scheduled component carriers can be associated with a third search space set. In this example, the first, second, and third search space sets can be associated with a common (e.g., the same) search space set index. Therefore, UE 115-b can be configured to monitor the first and second search space set indices based on the association of the first, second, and third search space indices across the scheduling and scheduled component carriers with a common search space set index.

[0221] At 620, UE 115-b can receive a first repetition of the control message from base station 105-b. In some aspects, the control message can schedule communication between UE 115-b and base station 105-b on a first component carrier (e.g., a scheduled component carrier). The communication scheduled by the control message can include PDSCH transmission, PUSCH transmission, or both. Therefore, the control message can indicate SPS release and / or configured permission release on the scheduled component carrier (e.g., permission configured for uplink type 2). The control message can include DCI messages (e.g., DCI formats 0_1, 0_2, 1_1, and / or 1_2).

[0222] In some aspects, UE 115-b may receive a first repetition of control messages within a first downlink control channel candidate, which is linked for control channel repetition configured by a scheduling configuration. In this respect, UE 115-b may receive the first repetition of control messages based on (e.g., according to) a scheduling configuration received at 605. Alternatively or additionally, UE 115-b may receive the first repetition of control messages at 620 based on identifying a reference downlink control channel candidate (e.g., a reference PDCCH candidate) at 610, monitoring a search space set at 615, or any combination thereof.

[0223] At position 625, UE 115-b can receive a second repetition of the control message received at position 620 from base station 105-b. Therefore, the second repetition of the control message can schedule communication between UE 115-b and base station 105-b on a first component carrier (e.g., a scheduled component carrier) (e.g., PDSCH / SPS release, PDSCH / configuration permission release). The control message may include DCI messages (e.g., DCI formats 0_1, 0_2, 1_1, and / or 1_2).

[0224] In some aspects, the second repetition of the control message received at 625 may include the same data payload as the first repetition of the control message received at 620, and may schedule the same communication as the first repetition of the control message received at 620. In some aspects, UE 115-b may receive the second repetition of the control message within a second downlink control channel candidate, which is linked for control channel repetitions configured by a scheduling configuration. In this respect, UE 115-b may receive the second repetition of the control message based on (e.g., according to) a scheduling configuration received at 605. Alternatively or additionally, UE 115-b may receive the second repetition of the control message at 625 based on identifying a reference downlink control channel candidate (e.g., a reference PDCCH candidate) at 610, monitoring a search space set at 615, receiving the first repetition of the control message at 620, or any combination thereof.

[0225] In some cases, UE 115-b may receive the first and second repetitions of the control message at 620 and 625, respectively. In other cases, UE 115-b may receive only one of the first or second repetitions of the control message. For example, in some cases, interference may affect the performance of communication performed on the scheduling component carrier associated with the first PDCCH candidate, but may not affect the performance of communication performed on the scheduling component carrier associated with the second PDCCH candidate. Therefore, in this example, UE 115-b may not successfully receive the first repetition of the control message at 620, but may successfully receive the second repetition of the control message at 625.

[0226] If UE 115-b receives only the first or second repetition of the control message, UE 115-b may demodulate / decode the single repetition of the received control message. In other cases where UE 115-b receives both the first and second repetitions of the control message, UE 115-b may demodulate / decode only one of the first or second repetitions of the control message. Alternatively, UE 115-b may combine the first and second repetitions of the control message described at 630 of process flow 600.

[0227] At 630, UE 115-b can perform soft combination of the first and second repetitions of the control message received at 620 and 625. In some aspects, for example, UE 115-b can perform soft combination (e.g., perform one or more soft combination procedures) to demodulate / decode the repetitions of the control message. In particular, UE 115-b can perform soft combination of a first signal corresponding to a first PDCCH candidate (e.g., the first repetition of the control message) and a second signal corresponding to a second PDCCH candidate (e.g., the second repetition of the control message).

[0228] At 635, UE 115-b may send a feedback message to base station 105-b. UE 115-b may send the feedback message based on (e.g., in response to) receiving at least one repetition of a control message. The feedback message may include HARQ messages (e.g., ACK, NACK). In some aspects, UE 115-b may send the feedback message at 635 based on receiving scheduling configuration at 605, identifying reference PDCCH candidates at 610, monitoring the search space set at 615, receiving first and / or second repetitions of control messages at 620 and / or 625, performing soft combination at 630, or any combination thereof.

[0229] In some aspects, UE 115-b can determine one or more parameters / characteristics associated with a feedback message based on identified reference PDCCH candidates. The parameters / characteristics of the feedback message that can be determined based on the reference PDCCH candidates may include, but are not limited to, the resources used to send the feedback message, the payload size of the feedback message, or any combination thereof.

[0230] At 640, UE 115-b can perform (e.g., send, receive) communications scheduled on the scheduled component carrier by one or more repetitions of the control message. For example, if the scheduled communication includes a PUSCH transmission, UE 115-b can send the scheduled PUSCH transmission to base station 105-b at 640 on the scheduled component carrier. As another example, if the scheduled communication includes a PDSCH transmission, UE 115-a can receive the scheduled PDSCH transmission from base station 105-b at 640 on the scheduled component carrier.

[0231] UE 115-b and base station 105-b can perform scheduled communication at 640 based on sending / receiving scheduling configuration at 605, identifying reference PDCCH candidates at 610, monitoring the search space set at 615, sending / receiving repetition of control messages at 620 and 625, performing soft combination, sending / receiving feedback messages at 635, or any combination thereof.

[0232] In some aspects, UE 115-b can determine one or more parameters / characteristics associated with scheduled communications based on identified reference PDCCH candidates. The parameters / characteristics of the scheduled communications that can be determined based on the reference PDCCH candidates may include, but are not limited to, the offset (e.g., slot offset) of the scheduled communications, the beam of the scheduled communications, the preparation time of the scheduled communications, or any combination thereof.

[0233] The techniques described herein can provide improved cross-carrier scheduling. Specifically, the techniques described herein enable the use of PDCCH repetition within the context of cross-carrier scheduling, allowing for multiple PDCCH repetitions across multiple scheduling component carriers to schedule communication within the scheduled component carriers. By implementing PDCCH repetition within the context of cross-carrier scheduling, the techniques described herein improve the transmission diversity (e.g., frequency diversity, beam diversity) of control messages used for cross-carrier scheduling. Therefore, by improving transmission diversity and implementing multiple repetitions of control signaling to schedule communication on the scheduled component carriers, the techniques described herein improve the reliability of control signaling used for cross-carrier scheduling, enabling more efficient and wider use of cross-carrier scheduling.

[0234] Figure 7A block diagram 700 of an apparatus 705 supporting techniques for control channel repetition across component carriers, according to various aspects of this disclosure, is shown. Apparatus 705 may be an example of various aspects of UE 115 as described herein. Apparatus 705 may include a receiver 710, a transmitter 715, and a communications manager 720. Apparatus 705 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0235] Receiver 710 may provide a unit for receiving information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels, etc., related to techniques for repeating control channels across component carriers). Information may be transmitted to other components of device 705. Receiver 710 may utilize a single antenna or a collection of multiple antennas.

[0236] Transmitter 715 may provide a unit for transmitting signals generated by other components of device 705. For example, transmitter 715 may transmit information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels related to techniques for repeating control channels across component carriers). In some examples, transmitter 715 may be co-located with receiver 710 in a transceiver module. Transmitter 715 may utilize a single antenna or a collection of multiple antennas.

[0237] The communication manager 720, receiver 710, transmitter 715, or various combinations thereof, or various components thereof, may be examples of units for performing various aspects of the techniques described herein for control channel repetition across component carriers. For example, the communication manager 720, receiver 710, transmitter 715, or various combinations thereof, or components thereof, may support methods for performing one or more of the functions described herein.

[0238] In some examples, the communication manager 720, receiver 710, transmitter 715, or various combinations or components thereof may be implemented in hardware (e.g., in communication management circuitry). The hardware may include a processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof configured to or otherwise support units for performing the functions described herein. In some examples, the processor and memory coupled to the processor may be configured to perform one or more of the functions described herein (e.g., by executing instructions stored in memory by the processor).

[0239] Alternatively or concurrently, in some examples, the communication manager 720, receiver 710, transmitter 715, or various combinations or components thereof may be implemented using code executed by a processor (e.g., as communication management software or firmware). If implemented using processor-executed code, the functionality of the communication manager 720, receiver 710, transmitter 715, or various combinations or components thereof may be performed by a general-purpose processor, DSP, central processing unit (CPU), ASIC, FPGA, or any combination of these or other programmable logic devices (e.g., a unit configured or otherwise supported for performing the functions described in this disclosure).

[0240] In some examples, the communication manager 720 can be configured to use or otherwise cooperate with the receiver 710, transmitter 715, or both to perform various operations (e.g., receiving, monitoring, transmitting). For example, the communication manager 720 can receive information from the receiver 710, send information to the transmitter 715, or integrate with the receiver 710, transmitter 715, or both to receive information, send information, or perform various other operations as described herein.

[0241] According to the examples disclosed herein, the communication manager 720 can support wireless communication at the UE. For example, the communication manager 720 can be configured or otherwise support elements for receiving from a base station a scheduling configuration for scheduling communication on a first component carrier, the scheduling configuration indicating at least a first downlink control channel candidate on a second component carrier, the first downlink control channel candidate being linked to a second downlink control channel candidate on one of the first or third component carriers for control channel repetition. The communication manager 720 can be configured or otherwise support elements for receiving at least one repetition of a control message from the first or second downlink control channel candidate based on the scheduling configuration, the control message scheduling communication between the base station and the UE on the first component carrier. The communication manager 720 can be configured or otherwise support elements for transmitting or receiving communication with the base station on the first component carrier.

[0242] By including or configuring a communication manager 720 according to the examples described herein, device 705 (e.g., a processor that controls or otherwise couples to receiver 710, transmitter 715, communication manager 720, or combinations thereof) can support techniques for improved cross-carrier scheduling. In particular, the techniques described herein enable the use of PDCCH repetition in the context of cross-carrier scheduling, which allows for multiple PDCCH repetitions across multiple scheduled component carriers to schedule communication within the scheduled component carriers. By implementing PDCCH repetition in the context of cross-carrier scheduling, the techniques described herein improve the transmission diversity (e.g., frequency diversity, beam diversity) of control messages used for cross-carrier scheduling. Therefore, by improving transmission diversity and implementing multiple repetitions of control signaling to schedule communication on scheduled component carriers, the techniques described herein improve the reliability of control signaling used for cross-carrier scheduling, enabling more efficient and wider use of cross-carrier scheduling.

[0243] Figure 8 A block diagram 800 of an apparatus 805 supporting techniques for control channel repetition across component carriers, according to various aspects of this disclosure, is shown. Apparatus 805 may be an example of aspects of apparatus 705 or UE 115 as described herein. Apparatus 805 may include a receiver 810, a transmitter 815, and a communications manager 820. Apparatus 805 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0244] Receiver 810 may provide a unit for receiving information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels, etc., related to techniques for repeating control channels across component carriers). Information may be transmitted to other components of device 805. Receiver 810 may utilize a single antenna or a collection of antennas.

[0245] Transmitter 815 may provide a unit for transmitting signals generated by other components of device 805. For example, transmitter 815 may transmit information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels, etc., related to techniques for repeating control channels across component carriers). In some examples, transmitter 815 may be co-located with receiver 810 in a transceiver module. Transmitter 815 may utilize a single antenna or a collection of multiple antennas.

[0246] Device 805 or its various components may be examples of units for performing various aspects of the techniques described herein for control channel repetition across component carriers. For example, communication manager 820 may include scheduling configuration receiver manager 825, control message receiver manager 830, base station communication manager 835, or any combination thereof. Communication manager 820 may be examples of various aspects of communication manager 720 as described herein. In some examples, communication manager 820 or its various components may be configured to use receiver 810, transmitter 815, or both, or otherwise cooperate with receiver 810, transmitter 815, or both to perform various operations (e.g., receiving, monitoring, transmitting). For example, communication manager 820 may receive information from receiver 810, send information to transmitter 815, or be integrated with receiver 810, transmitter 815, or both to receive information, send information, or perform various other operations as described herein.

[0247] According to the examples disclosed herein, the communication manager 820 can support wireless communication at the UE. The scheduling configuration receiving manager 825 can be configured or otherwise supported to support elements for receiving from the base station a scheduling configuration for scheduling communication on a first component carrier, the scheduling configuration indicating at least a first downlink control channel candidate on a second component carrier, the first downlink control channel candidate being linked to a second downlink control channel candidate on one of the first or third component carriers for control channel repetition. The control message receiving manager 830 can be configured or otherwise supported to support elements for receiving at least one repetition of a control message from the first or second downlink control channel candidate from the base station based on the scheduling configuration, the control message scheduling communication between the base station and the UE on the first component carrier. The base station communication manager 835 can be configured or otherwise supported to support elements for transmitting or receiving communication with the base station on the first component carrier.

[0248] Figure 9A block diagram 900 of a communication manager 920 supporting techniques for control channel repetition across component carriers, according to various aspects of this disclosure, is shown. The communication manager 920 may be an example of aspects of the communication manager 720, communication manager 820, or both as described herein. The communication manager 920 or its various components may be examples of units for implementing various aspects of the techniques for control channel repetition across component carriers as described herein. For example, the communication manager 920 may include a scheduling configuration receiver manager 925, a control message receiver manager 930, a base station communication manager 935, a search space set monitoring manager 940, a reference PDCCH candidate manager 945, a signal combination manager 950, a feedback message transmission manager 955, or any combination thereof. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0249] According to the examples disclosed herein, the communication manager 920 can support wireless communication at the UE. The scheduling configuration receiving manager 925 can be configured or otherwise supported to support elements for receiving from the base station a scheduling configuration for scheduling communication on a first component carrier, the scheduling configuration indicating at least a first downlink control channel candidate on a second component carrier, the first downlink control channel candidate being linked to a second downlink control channel candidate on one of the first or third component carriers for control channel repetition. The control message receiving manager 930 can be configured or otherwise supported to support elements for receiving at least one repetition of a control message from the first or second downlink control channel candidate from the base station based on the scheduling configuration, the control message scheduling communication between the base station and the UE on the first component carrier. The base station communication manager 935 can be configured or otherwise supported to support elements for transmitting or receiving communication with the base station on the first component carrier.

[0250] In some examples, the scheduling configuration receive manager 925 may be configured or otherwise supported for receiving indications of a first search space set associated with a first downlink control channel candidate and a second search space set associated with a second downlink control channel candidate via scheduling configuration. In some examples, the search space set monitoring manager 940 may be configured or otherwise supported for monitoring the first and second search space sets based on indications of the first and second search space sets, wherein the at least one repetition of the received control message is based on this monitoring.

[0251] In some examples, the scheduling configuration receiver manager 925 may be configured or otherwise supported to include a unit for receiving, via scheduling configuration, an indication of a first subcarrier interval of a first component carrier and a second subcarrier interval of a second or third component carrier, wherein the monitoring is based on the indication of the first and second subcarrier intervals.

[0252] In some examples, the first subcarrier spacing and the second subcarrier spacing are the same, and the scheduling configuration receiver manager 925 can be configured or otherwise supported to receive, via scheduling configuration, an indication of a period associated with both the first search space set and the second search space set, wherein the monitoring is period-based.

[0253] In some examples, the first subcarrier spacing differs from the second subcarrier spacing, and the scheduling configuration receiver manager 925 can be configured or otherwise supported to receive, via scheduling configuration, indications of a first period associated with a first search space set and a second period associated with a second search space set, wherein the first period differs from the second period, and wherein the monitoring is based on the first period, the second period, or both. In some examples, a first ratio between the first and second subcarrier spacings is the same as a second ratio between the first and second periods.

[0254] In some examples, the first search space set includes a first number of downlink control channel candidates, the first number of downlink control channel candidates includes first downlink control channel candidates, and the second search space set includes a second number of downlink control channel candidates, the second number of downlink control channel candidates includes second downlink control channel candidates. In some examples, the first number and the second number are the same.

[0255] In some examples, the first search space set and the second search space set are associated with a common search space set index.

[0256] In some examples, the scheduling configuration receiver manager 925 may be configured or otherwise supported for receiving, via scheduling configuration, an indication of a third search space set associated with a first component carrier, the third search space set being associated with a common search space set index, wherein monitoring of the first and second search space sets is based on the first search space set, the second search space set, and the third search space set being associated with the common search space set index.

[0257] In some examples, to support at least one repetition of received control messages, the control message receive manager 930 may be configured or otherwise support units for receiving a first repetition of control messages in a first downlink control channel candidate. In some examples, to support at least one repetition of received control messages, the control message receive manager 930 may be configured or otherwise support units for receiving a second repetition of control messages in a second downlink control channel candidate, wherein sending or receiving communication is based on receiving the first repetition of control messages, the second repetition of control messages, or both.

[0258] In some examples, the signal combination manager 950 may be configured or otherwise supported as a unit for performing a soft combination of a first signal corresponding to a first downlink control channel candidate and a second signal corresponding to a second downlink control channel candidate to decode control messages.

[0259] In some examples, the reference PDCCH candidate manager 945 may be configured or otherwise supported to identify one of the first downlink control channel candidate or the second downlink control channel candidate as the reference downlink control channel candidate.

[0260] In some examples, the scheduling configuration receiver manager 925 may be configured or otherwise supported to receive an indication of a reference downlink control channel candidate via scheduling configuration, wherein the identification of either a first downlink control channel candidate or a second downlink control channel candidate as a reference downlink control channel candidate is based on the scheduling configuration.

[0261] In some examples, a first downlink control channel candidate is associated with a first search space set, and a second downlink control channel candidate is associated with a second search space set. The reference PDCCH candidate manager 945 can be configured or otherwise supported to identify one of the first downlink control channel candidates or the second downlink control channel candidate as a reference downlink control channel candidate based on one or more parameters associated with a first component carrier, a second component carrier, a third component carrier, or any combination thereof. The one or more parameters include a component carrier index, a subcarrier spacing, or both.

[0262] In some examples, the reference PDCCH candidate manager 945 may be configured or otherwise supported to identify one of the first downlink control channel candidates or the second downlink control channel candidate as a reference downlink control channel candidate based on which of the first downlink control channel candidate or the second downlink control channel candidate ends later in the time domain, which of the first downlink control channel candidate or the second downlink control channel candidate starts earlier in the time domain, based on the second downlink control channel candidate in the first component carrier, or any combination thereof.

[0263] In some examples, the feedback message sending manager 955 may be configured or otherwise supported as an element for sending at least one repeated feedback message in response to a control message within a resource determined based on a reference downlink control channel candidate. In some examples, the feedback message sending manager 955 may be configured or otherwise supported as an element for sending a feedback message with a payload size determined based on a downlink assignment index, wherein the downlink assignment index is based on a reference downlink control channel candidate.

[0264] In some examples, to support transmitting or receiving communications, the base station communication manager 935 may be configured or otherwise supported to include elements for transmitting or receiving communications with the base station within a time slot offset relative to a reference downlink control channel candidate. In some examples, to support transmitting or receiving communications, the base station communication manager 935 may be configured or otherwise supported to include elements for transmitting or receiving communications with the base station based on a beam determined based on a reference downlink control channel candidate.

[0265] In some examples, to support sending or receiving communication, the base station communication manager 935 may be configured or otherwise support units for sending or receiving communication based on a preparation time associated with the communication, a channel state information calculation time associated with the communication, or both, the preparation time being determined based on a reference downlink control channel candidate, and the channel state information calculation time being determined based on a reference downlink control channel candidate.

[0266] In some examples, control messages include downlink control information messages. In some examples, sending or receiving communication is based on at least one repetition of control messages.

[0267] Figure 10A diagram of a system 1000 including a device 1005 supporting techniques for control channel repetition across component carriers, according to various aspects of this disclosure, is shown. Device 1005 may be an example of device 705, device 805, or UE 115 as described herein, or may include components thereof. Device 1005 may wirelessly communicate with one or more base stations 105, UE 105, or any combination thereof. Device 1005 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, such as a communication manager 1020, an input / output (I / O) controller 1010, a transceiver 1015, an antenna 1025, a memory 1030, a code 1035, and a processor 1040. These components may be electronically communicated or otherwise coupled via one or more buses (e.g., bus 1045) or otherwise (e.g., operational ground, communication ground, functional ground, electronic ground, electrical ground).

[0268] I / O controller 1010 can manage input and output signals for device 1005. I / O controller 1010 can also manage peripheral devices not integrated into device 1005. In some cases, I / O controller 1010 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 1010 can utilize, for example... This can be an operating system such as I / O controller 1010 or another known operating system. Alternatively, I / O controller 1010 may represent or interact with a modem, keyboard, mouse, touchscreen, or similar device. In some cases, I / O controller 1010 may be implemented as part of a processor (such as processor 1040). In some cases, a user may interact with device 1005 via I / O controller 1010 or via hardware components controlled by I / O controller 1010.

[0269] In some cases, device 1005 may include a single antenna 1025. However, in other cases, device 1005 may have more than one antenna 1025, which are capable of transmitting or receiving multiple wireless transmissions simultaneously. Transceiver 1015 may communicate bidirectionally via one or more antennas 1025, wired or wireless links as described herein. For example, transceiver 1015 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. Transceiver 1015 may also include a modem for modulating packets, providing modulated packets to one or more antennas 1025 for transmission, and demodulating packets received from one or more antennas 1025. Transceiver 1015, or transceiver 1015 and one or more antennas 1025, may be an example of transmitter 715, transmitter 815, receiver 710, receiver 810, or any combination thereof or components thereof as described herein.

[0270] Memory 1030 may include random access memory (RAM) and read-only memory (ROM). Memory 1030 may store computer-readable, computer-executable code 1035, which includes instructions that, when executed by processor 1040, cause device 1005 to perform the various functions described herein. Code 1035 may be stored in a non-transitory computer-readable medium, such as system memory or another type of memory. In some cases, code 1035 may not be directly executable by processor 1040, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein. In some additional cases, memory 1030 may also include a basic I / O system (BIOS) that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0271] Processor 1040 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 1040 may be configured to use a memory controller to operate a memory array. In other cases, the memory controller may be integrated into processor 1040. Processor 1040 may be configured to execute computer-readable instructions stored in memory (e.g., memory 1030) to cause device 1005 to perform various functions (e.g., functions or tasks supporting techniques for control channel repetition across component carriers). For example, device 1005 or components of device 1005 may include processor 1040 and memory 1030 coupled to processor 1040, processor 1040 and memory 1030 being configured to perform the various functions described herein.

[0272] According to the examples disclosed herein, the communication manager 1020 can support wireless communication at the UE. For example, the communication manager 1020 can be configured or otherwise support elements for receiving from a base station a scheduling configuration for scheduling communication on a first component carrier, the scheduling configuration indicating at least a first downlink control channel candidate on a second component carrier, the first downlink control channel candidate being linked to a second downlink control channel candidate on one of the first or third component carriers for control channel repetition. The communication manager 1020 can be configured or otherwise support elements for receiving at least one repetition of a control message from the first or second downlink control channel candidate based on the scheduling configuration, the control message scheduling communication between the base station and the UE on the first component carrier. The communication manager 1020 can be configured or otherwise support elements for transmitting or receiving communication with the base station on the first component carrier.

[0273] By including or configuring the communication manager 1020 according to the examples described herein, device 1005 can support techniques for improved cross-carrier scheduling. In particular, the techniques described herein enable the use of PDCCH repetition in the context of cross-carrier scheduling, which allows for multiple PDCCH repetitions across multiple scheduled component carriers to schedule communication within the scheduled component carriers. By implementing PDCCH repetition in the context of cross-carrier scheduling, the techniques described herein improve the transmission diversity (e.g., frequency diversity, beam diversity) of control messages used for cross-carrier scheduling. Therefore, by improving transmission diversity and implementing multiple repetitions of control signaling to schedule communication on the scheduled component carriers, the techniques described herein improve the reliability of control signaling used for cross-carrier scheduling, enabling more efficient and wider use of cross-carrier scheduling.

[0274] In some examples, the communication manager 1020 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or in cooperation with transceiver 1015, one or more antennas 1025, or any combination thereof. Although the communication manager 1020 is shown as a separate component, in some examples, one or more functions described with reference to the communication manager 1020 may be supported or executed by processor 1040, memory 1030, code 1035, or any combination thereof. For example, code 1035 may include instructions executable by processor 1040 to cause device 1005 to perform various aspects of the techniques described herein for control channel repetition across component carriers, or processor 1040 and memory 1030 may be otherwise configured to perform or support such operations.

[0275] Figure 11A block diagram 1100 of an apparatus 1105 supporting techniques for control channel repetition across component carriers, according to various aspects of this disclosure, is shown. Apparatus 1105 may be an example of various aspects of base station 105 as described herein. Apparatus 1105 may include a receiver 1110, a transmitter 1115, and a communication manager 1120. Apparatus 1105 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0276] Receiver 1110 may provide a unit for receiving information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels, etc., related to techniques for repeating control channels across component carriers). Information may be passed to other components of device 1105. Receiver 1110 may utilize a single antenna or a collection of multiple antennas.

[0277] Transmitter 1115 may provide a unit for transmitting signals generated by other components of device 1105. For example, transmitter 1115 may transmit information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels, etc., related to techniques for repeating control channels across component carriers). In some examples, transmitter 1115 may be co-located with receiver 1110 in a transceiver module. Transmitter 1115 may utilize a single antenna or a collection of multiple antennas.

[0278] The communication manager 1120, receiver 1110, transmitter 1115, or various combinations thereof, or various components thereof, may be examples of units for performing various aspects of the techniques described herein for control channel repetition across component carriers. For example, the communication manager 1120, receiver 1110, transmitter 1115, or various combinations thereof, or components thereof, may support methods for performing one or more of the functions described herein.

[0279] In some examples, the communication manager 1120, receiver 1110, transmitter 1115, or various combinations or components thereof may be implemented in hardware (e.g., in communication management circuitry). The hardware may include processors, DSPs, ASICs, FPGAs, or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or any combination thereof, configured to or otherwise support units for performing the functions described herein. In some examples, a processor and memory coupled to a processor may be configured to perform one or more of the functions described herein (e.g., by executing instructions stored in memory by the processor).

[0280] Alternatively or concurrently, in some examples, the communication manager 1120, receiver 1110, transmitter 1115, or various combinations or components thereof may be implemented using code executed by a processor (e.g., as communication management software or firmware). If implemented using processor-executed code, the functionality of the communication manager 1120, receiver 1110, transmitter 1115, or various combinations or components thereof may be performed by a general-purpose processor, DSP, CPU, ASIC, FPGA, or any combination of these or other programmable logic devices (e.g., a unit configured or otherwise supported for performing the functions described in this disclosure).

[0281] In some examples, the communication manager 1120 may be configured to use or otherwise cooperate with the receiver 1110, transmitter 1115, or both to perform various operations (e.g., receiving, monitoring, transmitting). For example, the communication manager 1120 may receive information from the receiver 1110, send information to the transmitter 1115, or integrate with the receiver 1110, transmitter 1115, or both to receive information, send information, or perform various other operations as described herein.

[0282] According to the examples disclosed herein, the communication manager 1120 can support wireless communication at a base station. For example, the communication manager 1120 can be configured or otherwise support elements for sending a scheduling configuration to a user equipment (UE) for scheduling communication on a first component carrier, the scheduling configuration indicating at least a first downlink control channel candidate on a second component carrier, the first downlink control channel candidate being linked to a second downlink control channel candidate on one of the first or third component carriers for control channel repetition. The communication manager 1120 can be configured or otherwise support elements for sending at least one repetition of a control message from the first or second downlink control channel candidate to the UE based on the scheduling configuration, the control message scheduling communication between the base station and the UE on the first component carrier. The communication manager 1120 can be configured or otherwise support elements for sending or receiving communication with the UE on the first component carrier.

[0283] By including or configuring the communication manager 1120 according to the examples described herein, device 1105 (e.g., a processor that controls or is otherwise coupled to receiver 1110, transmitter 1115, communication manager 1120, or a combination thereof) can support techniques for improved cross-carrier scheduling. In particular, the techniques described herein enable the use of PDCCH repetition in the context of cross-carrier scheduling, which allows for multiple PDCCH repetitions across multiple scheduled component carriers to schedule communication within the scheduled component carriers. By implementing PDCCH repetition in the context of cross-carrier scheduling, the techniques described herein improve the transmission diversity (e.g., frequency diversity, beam diversity) of control messages used for cross-carrier scheduling. Therefore, by improving transmission diversity and implementing multiple repetitions of control signaling to schedule communication on scheduled component carriers, the techniques described herein improve the reliability of control signaling used for cross-carrier scheduling, enabling more efficient and wider use of cross-carrier scheduling.

[0284] Figure 12 A block diagram 1200 of an apparatus 1205 supporting techniques for control channel repetition across component carriers, according to various aspects of this disclosure, is shown. Apparatus 1205 may be an example of aspects of apparatus 1105 or base station 105 as described herein. Apparatus 1205 may include a receiver 1210, a transmitter 1215, and a communication manager 1220. Apparatus 1205 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0285] Receiver 1210 may provide a unit for receiving information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels, etc., related to techniques for repeating control channels across component carriers). Information may be passed to other components of device 1205. Receiver 1210 may utilize a single antenna or a collection of antennas.

[0286] Transmitter 1215 may provide a unit for transmitting signals generated by other components of device 1205. For example, transmitter 1215 may transmit information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels, etc., related to techniques for repeating control channels across component carriers). In some examples, transmitter 1215 may be co-located with receiver 1210 in a transceiver module. Transmitter 1215 may utilize a single antenna or a collection of multiple antennas.

[0287] Device 1205 or its various components may be examples of units for performing various aspects of the techniques described herein for control channel repetition across component carriers. For example, communication manager 1220 may include scheduling configuration transmission manager 1225, control message transmission manager 1230, UE communication manager 1235, or any combination thereof. Communication manager 1220 may be examples of various aspects of communication manager 1120 as described herein. In some examples, communication manager 1220 or its various components may be configured to use receiver 1210, transmitter 1215, or both, or otherwise cooperate with receiver 1210, transmitter 1215, or both to perform various operations (e.g., receiving, monitoring, transmitting). For example, communication manager 1220 may receive information from receiver 1210, transmit information to transmitter 1215, or be integrated with receiver 1210, transmitter 1215, or both to receive information, transmit information, or perform various other operations as described herein.

[0288] According to the examples disclosed herein, communication manager 1220 may support wireless communication at a base station. Scheduling configuration sending manager 1225 may be configured or otherwise supported to send to a user equipment (UE) a scheduling configuration for scheduling communication on a first component carrier, the scheduling configuration indicating at least a first downlink control channel candidate on a second component carrier, the first downlink control channel candidate being linked to a second downlink control channel candidate on one of the first or third component carriers for control channel repetition. Control message sending manager 1230 may be configured or otherwise supported to send to the UE at least one repetition of a control message from the first or second downlink control channel candidate based on the scheduling configuration, the control message scheduling communication between the base station and the UE on the first component carrier. UE communication manager 1235 may be configured or otherwise supported to send or receive communication with the UE on the first component carrier.

[0289] Figure 13A block diagram 1300 of a communication manager 1320 supporting techniques for control channel repetition across component carriers, according to various aspects of this disclosure, is shown. The communication manager 1320 may be an example of aspects of the communication manager 1120, communication manager 1220, or both, as described herein. The communication manager 1320 or its various components may be examples of units for implementing various aspects of the techniques for control channel repetition across component carriers as described herein. For example, the communication manager 1020 may include a scheduling configuration transmission manager 1325, a control message transmission manager 1330, a UE communication manager 1335, a reference PDCCH candidate manager 1340, a feedback message reception manager 1345, or any combination thereof. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0290] According to the examples disclosed herein, communication manager 1320 may support wireless communication at a base station. Scheduling configuration sending manager 1325 may be configured or otherwise supported to send to a user equipment (UE) a scheduling configuration for scheduling communication on a first component carrier, the scheduling configuration indicating at least a first downlink control channel candidate on a second component carrier, the first downlink control channel candidate being linked to a second downlink control channel candidate on one of the first or third component carriers for control channel repetition. Control message sending manager 1330 may be configured or otherwise supported to send to the UE at least one repetition of a control message from the first or second downlink control channel candidate based on the scheduling configuration, the control message scheduling communication between the base station and the UE on the first component carrier. UE communication manager 1335 may be configured or otherwise supported to send or receive communication with the UE on the first component carrier.

[0291] In some examples, the scheduling configuration sending manager 1325 may be configured or otherwise supported to send, via scheduling configuration, indications of a first search space set associated with a first downlink control channel candidate and a second search space set associated with a second downlink control channel candidate, wherein at least one repetition of the sending control message is based on the first search space set, the second search space set, or both.

[0292] In some examples, the scheduling configuration transmission manager 1325 may be configured or otherwise support units for transmitting, via scheduling configuration, an indication of a first subcarrier interval of a first component carrier and a second subcarrier interval of a second component carrier or a third component carrier, wherein at least one repetition of the transmission control message is based on the first subcarrier interval, the second subcarrier interval, or both.

[0293] In some examples, the first subcarrier spacing and the second subcarrier spacing are the same, and the scheduling configuration transmission manager 1325 can be configured or otherwise supported to support units for transmitting indications of periods associated with both the first and second search space sets via scheduling configuration, wherein at least one repetition of the transmission control message is period-based.

[0294] In some examples, the first subcarrier spacing differs from the second subcarrier spacing, and the scheduling configuration transmission manager 1325 may be configured or otherwise support elements for transmitting indications via scheduling configuration of a first period associated with a first search space set and a second period associated with a second search space set, wherein the first period differs from the second period, and wherein at least one repetition of the transmission control message is based on the first period, the second period, or both. In some examples, a first ratio between the first and second subcarrier spacings is the same as a second ratio between the first and second periods.

[0295] In some examples, the first search space set includes a first number of downlink control channel candidates, the first number of downlink control channel candidates includes first downlink control channel candidates, and the second search space set includes a second number of downlink control channel candidates, the second number of downlink control channel candidates includes second downlink control channel candidates. In some examples, the first number and the second number are the same. In some examples, the first search space set and the second search space set are associated with a common search space set index.

[0296] In some examples, the scheduling configuration transmission manager 1325 may be configured or otherwise supported to include units for transmitting, via scheduling configuration, an indication of a third search space set associated with a first component carrier, the third search space set being associated with a common search space set index.

[0297] In some examples, to support the transmission of at least one repetition of control messages, the control message transmission manager 1330 may be configured or otherwise support units for transmitting a first repetition of control messages in a first downlink control channel candidate. In some examples, to support the transmission of at least one repetition of control messages, the control message transmission manager 1330 may be configured or otherwise support units for transmitting a second repetition of control messages in a second downlink control channel candidate, wherein the transmission or reception of communication is based on transmitting the first repetition of control messages, the second repetition of control messages, or both.

[0298] In some examples, the reference PDCCH candidate manager 1340 may be configured or otherwise supported to identify one of the first downlink control channel candidate or the second downlink control channel candidate as the reference downlink control channel candidate.

[0299] In some examples, the scheduling configuration transmission manager 1325 may be configured or otherwise supported to provide a unit for transmitting an indication of a reference downlink control channel candidate via scheduling configuration, wherein the identification of either a first downlink control channel candidate or a second downlink control channel candidate as a reference downlink control channel candidate is based on the scheduling configuration.

[0300] In some examples, a first downlink control channel candidate is associated with a first search space set, and a second downlink control channel candidate is associated with a second search space set. The reference PDCCH candidate manager 1340 may be configured or otherwise supported to identify one of the first downlink control channel candidates or the second downlink control channel candidate as a reference downlink control channel candidate based on one or more parameters associated with a first component carrier, a second component carrier, a third component carrier, or any combination thereof. The one or more parameters include a component carrier index, a subcarrier spacing, or both.

[0301] In some examples, the reference PDCCH candidate manager 1340 may be configured or otherwise supported to identify one of the first downlink control channel candidates or the second downlink control channel candidate as a reference downlink control channel candidate based on which of the first downlink control channel candidate or the second downlink control channel candidate ends later in the time domain, which of the first downlink control channel candidate or the second downlink control channel candidate starts earlier in the time domain, based on the second downlink control channel candidate in the first component carrier, or any combination thereof.

[0302] In some examples, the feedback message receiving manager 1345 may be configured or otherwise supported as an element for receiving at least one repeating feedback message in response to a control message within a resource determined based on a reference downlink control channel candidate.

[0303] In some examples, the feedback message receiving manager 1345 may be configured or otherwise supported for receiving a unit with a payload size determined based on a downlink assignment index, wherein the downlink assignment index is based on a reference downlink control channel candidate.

[0304] In some examples, to support transmitting or receiving communications, the UE communication manager 1335 may be configured or otherwise support elements for transmitting or receiving communications with the UE within a time slot offset relative to a reference downlink control channel candidate. In some examples, to support transmitting or receiving communications, the UE communication manager 1335 may be configured or otherwise support elements for transmitting or receiving communications with the UE based on a beam determined based on a reference downlink control channel candidate.

[0305] In some examples, to support sending or receiving communications, the UE communications manager 1335 may be configured or otherwise support units for sending or receiving communications based on a preparation time associated with the communication, a channel state information calculation time associated with the communication, or both, the preparation time being determined based on a reference downlink control channel candidate, and the channel state information calculation time being determined based on a reference downlink control channel candidate.

[0306] In some examples, control messages include downlink control information messages. In some examples, sending or receiving communication is based on at least one repetition of control messages.

[0307] Figure 14 A diagram of a system 1400 including a device 1405 supporting techniques for control channel repetition across component carriers, according to various aspects of this disclosure, is shown. Device 1405 may be an example of device 1105, device 1205, or base station 105 as described herein, or may include components thereof. Device 1405 may wirelessly communicate with one or more base stations 105, UE 115, or any combination thereof. Device 1405 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, such as a communication manager 1420, a network communication manager 1410, a transceiver 1415, an antenna 1425, a memory 1430, code 1435, a processor 1440, and an inter-station communication manager 1445. These components may be electronically communicated or otherwise coupled via one or more buses (e.g., bus 1450).

[0308] Network communication manager 1410 can manage communication with core network 130 (e.g., via one or more wired backhaul links). For example, network communication manager 1410 can manage the transmission of data communication to client devices (e.g., one or more UEs 115).

[0309] In some cases, device 1405 may include a single antenna 1425. However, in other cases, device 1405 may have more than one antenna 1425, which are capable of transmitting or receiving multiple wireless transmissions simultaneously. Transceiver 1415 may communicate bidirectionally via one or more antennas 1425, wired or wireless links as described herein. For example, transceiver 1415 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. Transceiver 1415 may also include a modem for modulating packets, providing modulated packets to one or more antennas 1425 for transmission, and demodulating packets received from one or more antennas 1425. Transceiver 1415, or transceiver 1415 and one or more antennas 1425, may be an example of transmitter 1115, transmitter 1215, receiver 1110, receiver 1210, or any combination thereof or components thereof as described herein.

[0310] Memory 1430 may include RAM and ROM. Memory 1430 may store computer-readable, computer-executable code 1435, which includes instructions that, when executed by processor 1440, cause device 1405 to perform the various functions described herein. Code 1435 may be stored in a non-transitory computer-readable medium, such as system memory or other types of memory. In some cases, code 1435 may not be directly executable by processor 1440, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein. In some additional cases, memory 1430 may also contain a BIOS, which controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0311] Processor 1440 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 1440 may be configured to use a memory controller to operate a memory array. In other cases, the memory controller may be integrated into processor 1440. Processor 1440 may be configured to execute computer-readable instructions stored in memory (e.g., memory 1430) to cause device 1405 to perform various functions (e.g., functions or tasks supporting techniques for control channel repetition across component carriers). For example, device 1405 or components of device 1405 may include processor 1440 and memory 1430 coupled to processor 1440, processor 1440 and memory 1430 being configured to perform the various functions described herein.

[0312] Inter-site communication manager 1445 can manage communication with other base stations 105 and may include a controller or scheduler for cooperating with other base stations 105 to control communication with UE 115. For example, inter-site communication manager 1445 can coordinate the scheduling of transmissions to UE 115 to implement various interference mitigation techniques such as beamforming or joint transmission. In some examples, inter-site communication manager 1445 may provide an X2 interface within LTE / LTE-A wireless communication network technology to facilitate communication between base stations 105.

[0313] According to the examples disclosed herein, the communication manager 1420 can support wireless communication at a base station. For example, the communication manager 1420 can be configured or otherwise support elements for sending a scheduling configuration to a user equipment (UE) for scheduling communication on a first component carrier, the scheduling configuration indicating at least a first downlink control channel candidate on a second component carrier, the first downlink control channel candidate being linked to a second downlink control channel candidate on one of the first or third component carriers for control channel repetition. The communication manager 1420 can be configured or otherwise support elements for sending at least one repetition of a control message from the first or second downlink control channel candidate to the UE based on the scheduling configuration, the control message scheduling communication between the base station and the UE on the first component carrier. The communication manager 1420 can be configured or otherwise support elements for sending or receiving communication with the UE on the first component carrier.

[0314] By including or configuring the communication manager 1420 according to the examples described herein, device 1405 can support techniques for improved cross-carrier scheduling. In particular, the techniques described herein enable the use of PDCCH repetition in the context of cross-carrier scheduling, which allows for multiple PDCCH repetitions across multiple scheduled component carriers to schedule communication within the scheduled component carriers. By implementing PDCCH repetition in the context of cross-carrier scheduling, the techniques described herein improve the transmission diversity (e.g., frequency diversity, beam diversity) of control messages used for cross-carrier scheduling. Therefore, by improving transmission diversity and implementing multiple repetitions of control signaling to schedule communication on the scheduled component carriers, the techniques described herein improve the reliability of control signaling used for cross-carrier scheduling, enabling more efficient and wider use of cross-carrier scheduling.

[0315] In some examples, the communication manager 1420 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or in cooperation with transceiver 1415, one or more antennas 1425, or any combination thereof. Although the communication manager 1420 is shown as a separate component, in some examples, one or more functions described with reference to the communication manager 1420 may be supported or executed by processor 1440, memory 1430, code 1435, or any combination thereof. For example, code 1435 may include instructions executable by processor 1440 to cause device 1405 to perform various aspects of the techniques described herein for control channel repetition across component carriers, or processor 1440 and memory 1430 may be otherwise configured to perform or support such operations.

[0316] Figure 15 A flowchart illustrating a method 1500 for supporting control channel repetition across component carriers, according to various aspects of this disclosure, is shown. Operation of method 1500 can be implemented by a UE or its components as described herein. For example, operation of method 1500 can be performed by, as described in reference... Figures 1 to 10 The UE 115 described is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional units of the UE to perform the described function. Alternatively, the UE can use dedicated hardware to perform aspects of the described function.

[0317] At 1505, the method may include: receiving from a base station a scheduling configuration for scheduling communication on a first component carrier, the scheduling configuration indicating at least a first downlink control channel candidate on a second component carrier, the first downlink control channel candidate being linked to a second downlink control channel candidate on one of the first component carrier or a third component carrier for control channel repetition. The operation of 1505 can be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1505 may be provided by reference to... Figure 9 The described scheduling configuration is executed by the receiver manager 925.

[0318] At 1510, the method may include: receiving, based on a scheduling configuration, at least one repetition of a control message from a base station in a first downlink control channel candidate or a second downlink control channel candidate, wherein the control message schedules communication between the base station and the UE on a first component carrier. The operation of 1510 can be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1510 may be determined by reference to... Figure 9 The described control message receiving manager 930 is used to execute this.

[0319] At 1515, the method may include: transmitting or receiving communication with a base station on a first component carrier. The operation of 1515 can be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1515 may be derived from references... Figure 9 The base station communication manager 935 described is used to execute this.

[0320] Figure 16 A flowchart illustrating a method 1600 for supporting control channel repetition across component carriers, according to various aspects of this disclosure, is shown. Operation of method 1600 can be implemented by a UE or its components as described herein. For example, operation of method 1600 can be implemented by, as referred to... Figures 1 to 10 The UE 115 described is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional units of the UE to perform the described function. Alternatively, the UE can use dedicated hardware to perform aspects of the described function.

[0321] At 1605, the method may include: receiving from a base station a scheduling configuration for scheduling communication on a first component carrier, the scheduling configuration indicating at least a first downlink control channel candidate on a second component carrier, the first downlink control channel candidate being linked to a second downlink control channel candidate on one of the first component carrier or a third component carrier for control channel repetition. The operation of 1605 can be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1605 may be provided by reference to... Figure 9 The described scheduling configuration is executed by the receiver manager 925.

[0322] At 1610, the method may include: receiving, via scheduling configuration, indications of a first search space set associated with a first downlink control channel candidate and a second search space set associated with a second downlink control channel candidate. The operation of 1610 can be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1610 may be provided by reference to... Figure 9 The described scheduling configuration is executed by the receiver manager 925.

[0323] At 1615, the method may include: monitoring the first search space set and the second search space set based on indications of these sets. The operation at 1615 can be performed according to examples as disclosed herein. In some examples, aspects of the operation at 1615 may be determined by reference to... Figure 9 The search space set monitoring manager 940 described is used to perform this.

[0324] At 1620, the method may include: receiving at least one repetition of a control message from a base station based on a scheduling configuration, wherein the control message schedules communication between the base station and the UE on a first component carrier, and the reception of at least one repetition of the control message is based on this monitoring. The operation of 1620 can be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1620 may be determined by reference to... Figure 9 The described control message receiving manager 930 is used to execute this.

[0325] At 1625, the method may include: transmitting or receiving communication with a base station on a first component carrier. The operation of 1625 can be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1625 may be derived from references... Figure 9 The base station communication manager 935 described is used to execute this.

[0326] Figure 17 A flowchart illustrating a method 1700 for supporting control channel repetition across component carriers, according to various aspects of this disclosure, is shown. Operation of method 1700 can be implemented by a UE or its components as described herein. For example, operation of method 1700 can be implemented by, as referenced... Figures 1 to 10 The UE 115 described is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional units of the UE to perform the described function. Alternatively, the UE can use dedicated hardware to perform aspects of the described function.

[0327] At 1705, the method may include: receiving from a base station a scheduling configuration for scheduling communication on a first component carrier, the scheduling configuration indicating at least a first downlink control channel candidate on a second component carrier, the first downlink control channel candidate being linked to a second downlink control channel candidate on one of the first component carrier or a third component carrier for control channel repetition. The operation of 1705 can be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1705 may be provided by reference to... Figure 9 The described scheduling configuration is executed by the receiver manager 925.

[0328] At 1710, the method may include: receiving a first repetition of a control message from a first downlink control channel candidate based on a scheduling configuration, wherein the control message schedules communication between the base station and the UE on a first component carrier. The operation of 1710 can be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1710 may be provided by reference to... Figure 9 The described control message receiving manager 930 is used to execute this.

[0329] At 1715, the method may include: receiving a second repetition of a control message in a second downlink control channel candidate. The operation at 1715 can be performed according to examples as disclosed herein. In some examples, aspects of the operation at 1715 may be derived from, as referenced... Figure 9 The described control message receiving manager 930 is used to execute this.

[0330] At 1720, the method may include: transmitting or receiving communication with a base station on a first component carrier, wherein the transmission or reception of communication is based on a first repetition of a control message, a second repetition of a control message, or both. The operation of 1720 can be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1720 may be provided by reference to... Figure 9 The base station communication manager 935 described is used to execute this.

[0331] Figure 18 A flowchart illustrating a method 1800 for supporting control channel repetition across component carriers, according to various aspects of this disclosure, is shown. Operation of method 1800 can be implemented by a base station or its components as described herein. For example, operation of method 1800 can be implemented by, as referred to... Figures 1 to 6 The base station 105 described in sections 11 to 14 is used to perform this function. In some examples, the base station may execute a set of instructions to control the functional units of the base station to perform the described functions. Alternatively, the base station may use dedicated hardware to perform aspects of the described functions.

[0332] At 1805, the method may include: sending to the user equipment a scheduling configuration for scheduling communication on a first component carrier, the scheduling configuration indicating at least a first downlink control channel candidate on a second component carrier, the first downlink control channel candidate being linked to a second downlink control channel candidate on one of the first or third component carriers for control channel repetition. The operation at 1805 can be performed according to examples as disclosed herein. In some examples, aspects of the operation at 1805 may be provided by reference to... Figure 13 The described scheduling configuration is sent to the sending manager 1325 for execution.

[0333] At 1810, the method may include: sending at least one repeating unit of a control message from a first downlink control channel candidate or a second downlink control channel candidate to the UE based on a scheduling configuration, wherein the control message schedules communication between the base station and the UE on a first component carrier. The operation of 1810 can be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1810 may be determined by reference to... Figure 13 The control message sending manager 1330 described is used to execute this.

[0334] At 1815, the method may include: transmitting or receiving communication with the UE on a first component carrier. The operation at 1815 can be performed according to examples as disclosed herein. In some examples, aspects of the operation at 1815 may be derived from references... Figure 13 The UE communication manager 1335 described is used to perform this.

[0335] The following provides a summary of various aspects of this disclosure:

[0336] Aspect 1: A method for wireless communication at a UE, comprising: receiving from a base station a scheduling configuration for scheduling communication on a first component carrier, the scheduling configuration indicating at least a first downlink control channel candidate on a second component carrier, the first downlink control channel candidate being linked to a second downlink control channel candidate on one of the first component carrier or a third component carrier for control channel repetition; receiving from the base station at least in part, based on the scheduling configuration, at least one repetition of a control message from the first downlink control channel candidate or the second downlink control channel candidate, the control message scheduling communication between the base station and the UE on the first component carrier; and transmitting or receiving the communication with the base station on the first component carrier.

[0337] Aspect 2: The method according to aspect 1 further includes: receiving, via the scheduling configuration, an indication of a first search space set associated with the first downlink control channel candidate and a second search space set associated with the second downlink control channel candidate; and monitoring the first search space set and the second search space set at least in part based on the indication of the first search space set and the second search space set, wherein the at least one repetition of the control message is received at least in part based on the monitoring.

[0338] Aspect 3: The method according to aspect 2 further includes: receiving an indication of a first SCS of the first component carrier and a second SCS of the second component carrier or a third component carrier via the scheduling configuration, wherein the monitoring is based at least in part on the indication of the first SCS and the second SCS.

[0339] Aspect 4: The method according to aspect 3, wherein the first SCS and the second SCS are the same, the method further comprising: receiving an indication of a period associated with both the first search space set and the second search space set via the scheduling configuration, wherein the monitoring is at least partially based on the period.

[0340] Aspect 5: The method according to any one of Aspects 3 to 4, wherein the first SCS is different from the second SCS, the method further comprising: receiving, via the scheduling configuration, indications of a first period associated with the first search space set and a second period associated with the second search space set, wherein the first period is different from the second period, wherein the monitoring is at least partially based on the first period, the second period, or both.

[0341] Aspect 6: According to the method of aspect 5, wherein the first ratio between the first SCS and the second SCS is the same as the second ratio between the first period and the second period.

[0342] Aspect 7: The method according to any one of Aspects 2 to 6, wherein the first search space set includes a first number of downlink control channel candidates, the first number of downlink control channel candidates including the first downlink control channel candidates, and the second search space set includes a second number of downlink control channel candidates, the second number of downlink control channel candidates including the second downlink control channel candidates, the first number and the second number being the same.

[0343] Aspect 8: The method according to any one of Aspects 2 to 7, wherein the first search space set and the second search space set are associated with a common search space set index.

[0344] Aspect 9: The method according to aspect 8 further includes: receiving, via the scheduling configuration, an indication of a third search space set associated with the first component carrier, the third search space set being associated with the common search space set index, wherein monitoring of the first search space set and the second search space set is at least in part based on the first search space set, the second search space set, and the association of the third search space set with the common search space set index.

[0345] Aspect 10: The method according to any one of Aspects 1 to 9, wherein receiving the at least one repetition of the control message comprises: receiving a first repetition of the control message in a first downlink control channel candidate; and receiving a second repetition of the control message in a second downlink control channel candidate, wherein sending or receiving the communication is at least in part based on receiving the first repetition of the control message, the second repetition of the control message, or both.

[0346] Aspect 11: The method according to aspect 10 further includes: performing a soft combination of a first signal corresponding to the first downlink control channel candidate and a second signal corresponding to the second downlink control channel candidate to decode the control message.

[0347] Aspect 12: The method according to any one of aspects 1 to 11 further includes: identifying one of the first downlink control channel candidate or the second downlink control channel candidate as a reference downlink control channel candidate.

[0348] Aspect 13: The method according to aspect 12 further includes: receiving an indication of the reference downlink control channel candidate via the scheduling configuration, wherein identifying one of the first downlink control channel candidate or the second downlink control channel candidate as the reference downlink control channel candidate is at least partially based on the scheduling configuration.

[0349] Aspect 14: The method according to any one of Aspects 12 to 13, wherein the first downlink control channel candidate is associated with a first search space set and the second downlink control channel candidate is associated with a second search space set, the method further comprising: identifying one of the first downlink control channel candidate or the second downlink control channel candidate as the reference downlink control channel candidate based at least in part on one or more parameters associated with the first component carrier, the second component carrier, the third component carrier, or any combination thereof, the one or more parameters including a component carrier index, an SCS, or both.

[0350] Aspect 15: The method according to any one of Aspects 12 to 14 further comprises: identifying one of the first downlink control channel candidates or the second downlink control channel candidate as the reference downlink control channel candidate based at least in part on which of the first downlink control channel candidate or the second downlink control channel candidate ends later in the time domain, which of the first downlink control channel candidate or the second downlink control channel candidate starts earlier in the time domain, based on the second downlink control channel candidate in the first component carrier, or any combination thereof.

[0351] Aspect 16: The method according to any one of Aspects 12 to 15 further includes: transmitting within a resource at least one repeated feedback message in response to the control message, the resource being determined at least in part based on the reference downlink control channel candidate.

[0352] Aspect 17: The method according to any one of Aspects 12 to 16 further includes: sending a feedback message having a payload size, the payload size being determined at least in part based on the DAI, wherein the DAI is at least in part based on the reference downlink control channel candidate.

[0353] Aspect 18: The method according to any one of Aspects 12 to 17, wherein transmitting or receiving the communication comprises: transmitting or receiving the communication with the base station within a time slot relative to the candidate offset of the reference downlink control channel.

[0354] Aspect 19: The method according to any one of Aspects 12 to 18, wherein transmitting or receiving the communication comprises: transmitting or receiving the communication with the base station at least in part based on a beam, the beam being determined at least in part based on the reference downlink control channel candidate.

[0355] Aspect 20: The method according to any one of Aspects 12 to 19, wherein sending or receiving the communication comprises: sending or receiving the communication based at least in part on a preparation time associated with the communication, a CSI calculation time associated with the communication, or both, wherein the preparation time is determined at least in part based on the reference downlink control channel candidate, and the CSI calculation time is determined at least in part based on the reference downlink control channel candidate.

[0356] Aspect 21: The method according to any one of Aspects 1 to 20, wherein the control message includes a DCI message.

[0357] Aspect 22: The method according to any one of aspects 1 to 21, wherein sending or receiving the communication is at least in part based on the at least one repetition of the control message.

[0358] Aspect 23: A method for wireless communication at a base station, comprising: sending to a user equipment (UE) a scheduling configuration for scheduling communication on a first component carrier, the scheduling configuration indicating at least a first downlink control channel candidate on a second component carrier, the first downlink control channel candidate being linked to a second downlink control channel candidate on one of the first component carrier or a third component carrier for control channel repetition; sending to the UE at least in part, based on the scheduling configuration, at least one repetition of a control message from the first downlink control channel candidate or the second downlink control channel candidate, the control message scheduling communication between the base station and the UE on the first component carrier; and sending or receiving the communication with the UE on the first component carrier.

[0359] Aspect 24: The method according to aspect 23 further includes: transmitting, via the scheduling configuration, indications of a first search space set associated with the first downlink control channel candidate and a second search space set associated with the second downlink control channel candidate, wherein the at least one repetition of transmitting the control message is based at least in part on the first search space set, the second search space set, or both.

[0360] Aspect 25: The method according to aspect 24 further includes: transmitting an indication of a first SCS for the first component carrier and a second SCS for the second component carrier or a third component carrier via the scheduling configuration, wherein the at least one repetition of transmitting the control message is at least partially based on the first SCS, the second SCS, or both.

[0361] Aspect 26: The method according to aspect 25, wherein the first SCS and the second SCS are identical, the method further comprising: sending an indication of a period associated with both the first search space set and the second search space set via the scheduling configuration, wherein the at least one repetition of sending the control message is at least partially based on the period.

[0362] Aspect 27: The method according to any one of Aspects 25 to 26, wherein the first SCS is different from the second SCS, the method further comprising: sending indications of a first period associated with the first search space set and a second period associated with the second search space set via the scheduling configuration, wherein the first period is different from the second period, wherein the at least one repetition of sending the control message is at least partially based on the first period, the second period, or both.

[0363] Aspect 28: The method according to aspect 27, wherein the first ratio between the first SCS and the second SCS is the same as the second ratio between the first period and the second period.

[0364] Aspect 29: The method according to any one of Aspects 24 to 28, wherein the first search space set includes a first number of downlink control channel candidates, the first number of downlink control channel candidates including the first downlink control channel candidates, and the second search space set includes a second number of downlink control channel candidates, the second number of downlink control channel candidates including the second downlink control channel candidates, and the first number and the second number are the same.

[0365] Aspect 30: The method according to any one of Aspects 24 to 29, wherein the first search space set and the second search space set are associated with a common search space set index.

[0366] Aspect 31: The method according to aspect 30 further includes: transmitting an indication of a third search space set associated with the first component carrier via the scheduling configuration, the third search space set being associated with the common search space set index.

[0367] Aspect 32: The method according to any one of Aspects 23 to 31, wherein sending the at least one repetition of the control message comprises: sending a first repetition of the control message in a first downlink control channel candidate; and sending a second repetition of the control message in a second downlink control channel candidate, wherein sending or receiving the communication is at least in part based on sending the first repetition of the control message, the second repetition of the control message, or both.

[0368] Aspect 33: The method according to any one of aspects 23 to 32 further includes: identifying one of the first downlink control channel candidate or the second downlink control channel candidate as a reference downlink control channel candidate.

[0369] Aspect 34: The method according to aspect 33 further includes: sending an indication of the reference downlink control channel candidate via the scheduling configuration, wherein identifying one of the first downlink control channel candidate or the second downlink control channel candidate as the reference downlink control channel candidate is at least partially based on the scheduling configuration.

[0370] Aspect 35: The method according to any one of Aspects 33 to 34, wherein the first downlink control channel candidate is associated with a first search space set and the second downlink control channel candidate is associated with a second search space set, the method further comprising: identifying one of the first downlink control channel candidate or the second downlink control channel candidate as the reference downlink control channel candidate based at least in part on one or more parameters associated with the first component carrier, the second component carrier, the third component carrier, or any combination thereof, the one or more parameters including a component carrier index, an SCS, or both.

[0371] Aspect 36: The method according to any one of aspects 33 to 35 further includes: identifying one of the first downlink control channel candidates or the second downlink control channel candidate as the reference downlink control channel candidate based at least in part on which of the first downlink control channel candidate or the second downlink control channel candidate ends later in the time domain, which of the first downlink control channel candidate or the second downlink control channel candidate starts earlier in the time domain, based on the second downlink control channel candidate in the first component carrier, or any combination thereof.

[0372] Aspect 37: The method according to any one of aspects 33 to 36 further includes: receiving, within a resource, the at least one repeated feedback message in response to the control message, the resource being determined at least in part based on the reference downlink control channel candidate.

[0373] Aspect 38: The method according to any one of aspects 33 to 37 further includes: receiving a feedback message having a payload size, the payload size being determined at least in part based on the DAI, wherein the DAI is at least in part based on the reference downlink control channel candidate.

[0374] Aspect 39: The method according to any one of Aspects 33 to 38, wherein sending or receiving the communication comprises: sending or receiving the communication with the UE within a time slot relative to the candidate offset of the reference downlink control channel.

[0375] Aspect 40: The method according to any one of Aspects 33 to 39, wherein transmitting or receiving the communication comprises: transmitting or receiving the communication with the UE at least in part based on a beam, the beam being determined at least in part based on the reference downlink control channel candidate.

[0376] Aspect 41: The method according to any one of Aspects 33 to 40, wherein sending or receiving the communication comprises: sending or receiving the communication based at least in part on a preparation time associated with the communication, a CSI calculation time associated with the communication, or both, wherein the preparation time is determined at least in part based on the reference downlink control channel candidate, and the CSI calculation time is determined at least in part based on the reference downlink control channel candidate.

[0377] Aspect 42: The method according to any one of aspects 23 to 41, wherein the control message includes a DCI message.

[0378] Aspect 43: The method according to any one of aspects 23 to 42 further includes: sending or receiving the communication is at least in part based on the at least one repetition of the control message.

[0379] Aspect 44: An apparatus for wireless communication at a UE, 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 according to any one of aspects 1 to 22.

[0380] Aspect 45: An apparatus for wireless communication at a UE, comprising at least one unit for performing the method according to any one of aspects 1 to 22.

[0381] Aspect 46: A non-transitory computer-readable medium storing code for wireless communication at a UE, the code comprising instructions executable by a processor to perform the method according to any one of aspects 1 to 22.

[0382] Aspect 47: An apparatus for wireless communication at a base station, 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 according to any one of aspects 23 to 43.

[0383] Aspect 48: An apparatus for wireless communication at a base station, comprising at least one unit for performing the method according to any one of aspects 23 to 43.

[0384] Aspect 49: A non-transitory computer-readable medium storing code for wireless communication at a base station, the code including instructions executable by a processor to perform a method according to any one of aspects 23 to 43.

[0385] It should be noted that the methods described in this paper describe possible implementations, and the operations and steps can be rearranged or otherwise modified, and other implementations are possible. Furthermore, aspects from two or more methods can be combined.

[0386] While aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for illustrative purposes, and the terms LTE, LTE-A, LTE-A Pro, or NR may be used extensively in the description, the techniques described herein apply beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the techniques described can be applied to a variety of other wireless communication systems, such as Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0387] The information and signals described herein can be represented using any of a variety of different techniques and methods. For example, the data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout the description may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, light fields or particles, or any combination thereof.

[0388] The various illustrative blocks and components described herein can be implemented or performed using a general-purpose processor, DSP, ASIC, CPU, FPGA, or other programmable logic device, discrete gate or transistor logic, discrete hardware component, or any combination thereof designed to perform the functions described herein. The general-purpose processor may be a microprocessor, but alternatively, the processor may be any processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors combined with a DSP core, or any other such configuration).

[0389] The functions described herein can be implemented using hardware, software executed by a processor, firmware, or any combination thereof. If implemented using software executed by a processor, the functions can be stored as one or more instructions or code on or transmitted through a computer-readable medium. 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 can be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination of these. Features implementing the functions can also be physically located in various locations, including being distributed such that different parts of the functions are implemented in different physical locations.

[0390] Computer-readable media includes both non-transitory computer storage media and communication media, with communication media encompassing any medium that facilitates the transfer of computer programs from one place to another. Non-transitory storage media can be any available medium accessible by a general-purpose computer or a special-purpose computer. By way of example, and not limitation, non-transitory computer-readable media can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compressed optical disc (CD) ROM or other optical disc storage, disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired units of program code in the form of instructions or data structures, and accessible by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Furthermore, any connection is appropriately referred to as computer-readable media. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included within the definition of computer-readable media. As used herein, disks and optical discs include CDs, laser discs, optical discs, digital multifunction discs (DVDs), floppy disks, and Blu-ray discs, wherein disks typically copy data magnetically, while optical discs use lasers to copy data optically. The combinations described above are also included within the scope of computer-readable media.

[0391] As used herein (including in the claims), the word "or" in a list of items (e.g., a list of items ending with a phrase such as "at least one of" or "one or more of") indicates an inclusive list, such that 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 construed 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 way as the phrase "at least partially based on".

[0392] The term "determine" or "determining" encompasses a wide variety of actions, and therefore, "determining" can include calculation, operation, processing, derivation, investigation, searching (e.g., looking in a table, database, or other data structure), ascertaining, and so on. Furthermore, "determining" can include receiving (e.g., receiving information), accessing (e.g., accessing data in memory), and so on. Additionally, "determining" can include parsing, selecting, choosing, building, and other similar actions.

[0393] In the accompanying drawings, similar components or features may have the same reference numerals. Furthermore, various components of the same type can be distinguished by a dash and a second reference numeral following the reference numeral, used to differentiate between similar components. If only the first reference numeral is used in the specification, the description applies to any one of the similar components having the same first reference numeral, without regard to the second reference numeral or other subsequent reference numerals.

[0394] This document describes exemplary configurations in conjunction with the accompanying drawings, and does not represent all examples that can be implemented or that are within the scope of the claims. The term "example" as used herein means "serving as an example, instance, or illustration," and not "preferred" or "advantageous over other examples." The detailed description includes specific details for the purpose of providing an understanding of the described techniques. However, these techniques can be implemented without these specific details. In some cases, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0395] The description herein is provided to enable those skilled in the art to implement or use the present disclosure. Various modifications to the present disclosure will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other variations without departing from the scope of the disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but is to be given the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. An apparatus for wireless communication at a user equipment (UE), comprising: processor; Memory coupled to the processor; as well as Instructions, which are stored in the memory and can be executed by the processor, cause the device to perform the following operations: The system receives a scheduling configuration from the base station for scheduling communication on a first component carrier. The scheduling configuration indicates at least a first downlink control channel candidate on a second component carrier. The first downlink control channel candidate is repeatedly linked to a second downlink control channel candidate on one of the first component carrier or a third component carrier for control channel purposes. The system receives at least one repetition of a control message from the base station, either the first downlink control channel candidate or the second downlink control channel candidate, based at least in part on the scheduling configuration, the control message scheduling communication between the base station and the UE on the first component carrier; as well as The communication with the base station is transmitted or received on the first component carrier.

2. The apparatus according to claim 1, wherein, The instructions can also be executed by the processor to cause the device to perform the following operations: The scheduling configuration is used to receive indications of a first search space set associated with the first downlink control channel candidate and a second search space set associated with the second downlink control channel candidate. as well as The first search space set and the second search space set are monitored at least in part based on the indications to the first search space set and the second search space set, wherein the at least one repetition of receiving the control message is at least in part based on the monitoring.

3. The apparatus according to claim 2, wherein, The instructions can also be executed by the processor to cause the device to perform the following operations: The monitoring is at least partially based on the indications of the first subcarrier interval and the second subcarrier interval of the first component carrier or the third component carrier, via the scheduling configuration.

4. The apparatus according to claim 3, wherein, The first subcarrier spacing and the second subcarrier spacing are the same, and the instructions can also be executed by the processor to cause the device to perform the following operations: The monitoring is at least partially based on the period, and the indication of the period is received via the scheduling configuration.

5. The apparatus according to claim 3, wherein, The first subcarrier spacing is different from the second subcarrier spacing, and the instructions can also be executed by the processor to cause the device to perform the following operations: The scheduling configuration is used to receive indications for a first period associated with the first search space set and a second period associated with the second search space set, wherein the first period is different from the second period, and wherein the monitoring is based at least in part on the first period, the second period, or both.

6. The apparatus according to claim 5, wherein, The first ratio between the first subcarrier interval and the second subcarrier interval is the same as the second ratio between the first period and the second period.

7. The apparatus according to claim 2, wherein, The first search space set includes a first number of downlink control channel candidates, the first number of downlink control channel candidates includes the first downlink control channel candidate, and the second search space set includes a second number of downlink control channel candidates, the second number of downlink control channel candidates includes the second downlink control channel candidate, and wherein the first number and the second number are the same.

8. The apparatus according to claim 2, wherein, The first search space set and the second search space set are associated with a common search space set index.

9. The apparatus according to claim 8, wherein, The instructions can also be executed by the processor to cause the device to perform the following operations: The scheduling configuration receives an indication of a third search space set associated with the first component carrier, the third search space set being associated with the common search space set index, wherein monitoring of the first search space set and the second search space set is based at least in part on the fact that the first search space set, the second search space set, and the third search space set are associated with the common search space set index.

10. The apparatus according to claim 1, wherein, The at least one repeated instruction for receiving the control message can be executed by the processor to cause the device to perform the following operations: The first repetition of the control message is received in the first downlink control channel candidate; as well as The second repetition of the control message is received in the second downlink control channel candidate, wherein sending or receiving the communication is at least in part based on receiving the first repetition of the control message, the second repetition of the control message, or both.

11. The apparatus according to claim 10, wherein, The instructions can also be executed by the processor to cause the device to perform the following operations: A soft combination of a first signal corresponding to the first downlink control channel candidate and a second signal corresponding to the second downlink control channel candidate is performed to decode the control message.

12. The apparatus according to claim 1, wherein, The instructions can also be executed by the processor to cause the device to perform the following operations: The first downlink control channel candidate or the second downlink control channel candidate is identified as the reference downlink control channel candidate.

13. The apparatus according to claim 12, wherein, The instructions can also be executed by the processor to cause the device to perform the following operations: The indication of the reference downlink control channel candidate is received via the scheduling configuration, wherein identifying either the first downlink control channel candidate or the second downlink control channel candidate as the reference downlink control channel candidate is at least partially based on the scheduling configuration.

14. The apparatus according to claim 12, wherein, The first downlink control channel candidate is associated with a first search space set, and the second downlink control channel candidate is associated with a second search space set, and the instructions can also be executed by the processor to cause the device to perform the following operations: The first downlink control channel candidate or the second downlink control channel candidate is identified as the reference downlink control channel candidate based at least in part on one or more parameters associated with the first component carrier, the second component carrier, the third component carrier, or any combination thereof, including component carrier index, subcarrier spacing, or both.

15. The apparatus according to claim 12, wherein, The instructions can also be executed by the processor to cause the device to perform the following operations: The first downlink control channel candidate or the second downlink control channel candidate is identified as the reference downlink control channel candidate based at least in part on which of the first downlink control channel candidate or the second downlink control channel candidate ends later in the time domain, which of the first downlink control channel candidate or the second downlink control channel candidate starts earlier in the time domain, based on the second downlink control channel candidate in the first component carrier, or any combination thereof.

16. The apparatus according to claim 12, wherein, The instructions can also be executed by the processor to cause the device to perform the following operations: Send the at least one repeated feedback message in response to the control message within the resource, which is determined at least in part based on the reference downlink control channel candidate.

17. The apparatus according to claim 12, wherein, The instructions can also be executed by the processor to cause the device to perform the following operations: Send a feedback message with a payload size, the payload size being determined at least in part based on a downlink assignment index, wherein the downlink assignment index is at least in part based on the reference downlink control channel candidate.

18. The apparatus according to claim 12, wherein, The instructions for sending or receiving the communication can also be executed by the processor to cause the device to perform the following operations: The communication with the base station is transmitted or received within a time slot relative to the reference downlink control channel candidate offset.

19. The apparatus according to claim 12, wherein, The instructions for sending or receiving the communication can also be executed by the processor to cause the device to perform the following operations: The communication with the base station is transmitted or received at least in part based on a beam, which is determined at least in part based on the reference downlink control channel candidate.

20. The apparatus according to claim 12, wherein, The instructions for sending or receiving the communication can also be executed by the processor to cause the device to perform the following operations: The communication is transmitted or received based at least in part on a preparation time associated with the communication, a channel state information calculation time associated with the communication, or both, wherein the preparation time is determined at least in part based on the reference downlink control channel candidate, and the channel state information calculation time is determined at least in part based on the reference downlink control channel candidate.

21. The apparatus according to claim 1, wherein, The control messages include downlink control information messages.

22. The apparatus according to claim 1, wherein, Sending or receiving the communication is at least in part based on at least one repetition of the control message.

23. An apparatus for wireless communication at a base station, comprising: processor; Memory coupled to the processor; as well as Instructions, which are stored in the memory and can be executed by the processor, cause the device to perform the following operations: Send a scheduling configuration to the user equipment (UE) for scheduling communication on a first component carrier, the scheduling configuration indicating at least a first downlink control channel candidate on a second component carrier, the first downlink control channel candidate being repeatedly linked to a second downlink control channel candidate on one of the first component carrier or a third component carrier for control channel repetition. At least in part based on the scheduling configuration, at least one repetition of a control message from the first downlink control channel candidate or the second downlink control channel candidate is sent to the UE, the control message scheduling communication between the base station and the UE on the first component carrier; as well as The communication with the UE is transmitted or received on the first component carrier.

24. The apparatus according to claim 23, wherein, The instructions can also be executed by the processor to cause the device to perform the following operations: Instructions for a first search space set associated with the first downlink control channel candidate and a second search space set associated with the second downlink control channel candidate are sent via the scheduling configuration, wherein the at least one repetition of the control message is based at least in part on the first search space set, the second search space set, or both.

25. The apparatus according to claim 24, wherein, The instructions can also be executed by the processor to cause the device to perform the following operations: The scheduling configuration is used to send an indication of a first subcarrier interval of the first component carrier and a second subcarrier interval of the second component carrier or the third component carrier, wherein the at least one repetition of the control message is based at least in part on the first subcarrier interval, the second subcarrier interval, or both.

26. The apparatus according to claim 25, wherein, The first subcarrier spacing and the second subcarrier spacing are the same, and the instructions can also be executed by the processor to cause the device to perform the following operations: Indications for periods associated with both the first and second search space sets are sent via the scheduling configuration, wherein the at least one repetition of the control message is at least partially based on the period.

27. The apparatus according to claim 25, wherein, The first subcarrier spacing is different from the second subcarrier spacing, and the instructions can also be executed by the processor to cause the device to perform the following operations: Instructions for a first period associated with the first search space set and a second period associated with the second search space set are sent via the scheduling configuration, wherein the first period is different from the second period, and wherein the at least one repetition of sending the control message is based at least in part on the first period, the second period, or both.

28. The apparatus according to claim 27, wherein, The first ratio between the first subcarrier interval and the second subcarrier interval is the same as the second ratio between the first period and the second period.

29. A method for wireless communication at a user equipment (UE), comprising: The system receives a scheduling configuration from the base station for scheduling communication on a first component carrier. The scheduling configuration indicates at least a first downlink control channel candidate on a second component carrier. The first downlink control channel candidate is repeatedly linked to a second downlink control channel candidate on one of the first component carrier or a third component carrier for control channel purposes. The system receives at least one repetition of a control message from the base station, either the first downlink control channel candidate or the second downlink control channel candidate, based at least in part on the scheduling configuration, the control message scheduling communication between the base station and the UE on the first component carrier; as well as The communication with the base station is transmitted or received on the first component carrier.

30. A method for wireless communication at a base station, comprising: Send a scheduling configuration to the user equipment (UE) for scheduling communication on a first component carrier, the scheduling configuration indicating at least a first downlink control channel candidate on a second component carrier, the first downlink control channel candidate being repeatedly linked to a second downlink control channel candidate on one of the first component carrier or a third component carrier for control channel repetition. At least in part based on the scheduling configuration, at least one repetition of a control message from the first downlink control channel candidate or the second downlink control channel candidate is sent to the UE, the control message scheduling communication between the base station and the UE on the first component carrier; as well as The communication with the UE is transmitted or received on the first component carrier.

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