Default transmission beam for multiple transmit-receive points in wireless communications

Abstract

Methods, systems, and devices are described for wireless communication for simultaneous communication between multiple transmit-receive points (TRPs) and a user equipment (UE). A default beam for each TRP may be determined, and in the event that the default beam cannot be simultaneously received at the UE, a priority rule may be applied to determine which TRP uses the initially determined default beam, while other TRPs may use different beams. The UE may also be configured with subsets of the set of control resources for each TRP such that beams associated with the differently configured subsets are compatible and can be simultaneously received at the UE. Other techniques for providing compatibility between beams for multiple simultaneous TRP transmissions include determining a first beam, and selecting a second beam based on a mapping to the first beam or an explicit configuration of a base station.

Description

[0001] This application is a divisional application of the patent application with the same name with application number 202080069684.4 filed on October 9, 2020.

[0002] CROSS-REFERENCE TO RELATED APPLICATIONS

[0003] This patent application claims priority to U.S. patent application No. 17 / 066,066, filed by ZHOU et al. on October 8, 2020, entitled “DEFAULTTRANSMISSION BEAMS FOR MULTIPLE TRANSMISSION-RECEPTION POINTS IN WIRELESS COMMUNICATIONS,” which claims the benefit of U.S. Provisional Patent Application No. 62 / 914,330, filed by ZHOU et al. on October 11, 2019, entitled “DEFAULT TRANSMISSION BEAMS FOR MULTIPLETRANSMISSION-RECEPTION POINTS IN WIRELESS COMMUNICATIONS,” assigned to the assignee of this application. Technical Field

[0004] The following relates generally to wireless communications, and more specifically, to default transmission beams for multiple transmit-receive points in wireless communications. Background Art

[0005] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcast, etc. These systems may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems, such as long term evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems, which may be referred to as new radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include multiple base stations or network access nodes, each of which simultaneously supports communication for multiple communication devices, which may be otherwise referred to as user equipment (UE).

[0006] In some deployments, a base station such as a next generation or giga-nodeB (gNB) may support communications using one or more transmit reception points (TRPs) to improve reliability, coverage, capacity performance, or a combination thereof. In some cases, a UE may establish beamformed communication links with multiple TRPs to simultaneously receive and transmit communications with multiple TRPs. For example, a UE may receive a physical downlink control channel (PDCCH), decode control information from the PDCCH, and use the decoded control information to decode a subsequent physical downlink shared channel (PDSCH) transmission. In some cases, a PDCCH transmission and a PDSCH transmission may be scheduled together, and the UE may not be able to decode the PDCCH transmission prior to the PDSCH transmission (e.g., if the time between transmissions is below a threshold). Therefore, efficient and reliable techniques for simultaneously receiving transmissions from multiple TRPs in such situations are desirable. Summary of the invention

[0007] The described techniques relate to improved methods, systems, devices, and apparatuses for supporting default transmission beams for multiple transmit-receive points in wireless communications. According to various aspects, techniques are described for providing a default beam for determining two or more transmit-receive points (TRPs) for downlink communications that are simultaneously received at a user equipment (UE). In some cases, the TRP may use a default beam for downlink shared channel transmissions (e.g., physical downlink shared channel (PDSCH) transmissions), and the UE may use the default beam to monitor downlink shared channel transmissions that are sent within a time threshold of an associated control channel transmission (e.g., physical downlink control channel (PDCCH) transmission). In some cases, in order to allow the UE to simultaneously receive multiple transmissions from different TRPs via associated default beams, the default beams may be configured such that the UE can receive each default beam simultaneously.

[0008] In some cases, a default beam for each of multiple TRPs may be determined, and in the event that the default beams are not compatible (i.e., cannot be received simultaneously at the UE), the UE and the TRP may apply a priority rule to determine which TRP uses the initially determined default beam, while the other TRP (or multiple) may use a beam different from the initially determined default beam associated with the TRP. Such a priority rule may be a pre-configured rule that may be signaled by the serving base station (e.g., via radio resource control (RRC) signaling, media access control (MAC) control element (CE), downlink control information (DCI), or any combination thereof). In other cases, a CORESET subset for each TRP may be configured for the UE such that beams associated with different configured subsets are compatible and can be received simultaneously at the UE. In further cases, a first beam for a first TRP may be determined based on the lowest control resource set (CORESET) ID of the first TRP, and then a second beam for a second TRP may be determined based on a mapping to the first beam. In further cases, the serving base station may explicitly configure a default beam for one or more TRPs in order to provide a compatible default beam for each TRP.

[0009] A wireless communication method at a UE is described. The method may include: identifying a first default beam for receiving downlink transmissions from a first transmit-receive point and a second default beam for receiving downlink transmissions from a second transmit-receive point; determining that the first default beam and the second default beam cannot be received at the UE simultaneously; responsive to the determination and based at least in part on a predetermined priority rule, selecting one of the first default beam and the second default beam; and receiving downlink communications from the transmit-receive point associated with the selected default beam.

[0010] An apparatus for wireless communication at a UE is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to: identify a first default beam for receiving downlink transmissions from a first transmit-receive point and a second default beam for receiving downlink transmissions from a second transmit-receive point; determine that the first default beam and the second default beam cannot be received at the UE simultaneously, select one of the first default beam and the second default beam in response to the determination and based at least in part on a predetermined priority rule; and receive downlink communications from the transmit-receive point associated with the selected default beam.

[0011] Another apparatus for wireless communication at a UE is described. The apparatus may include: a component for identifying a first default beam for receiving downlink transmissions from a first transmit-receive point and a second default beam for receiving downlink transmissions from a second transmit-receive point; a component for determining that the first default beam and the second default beam cannot be received at the UE at the same time; a component for selecting one of the first default beam and the second default beam in response to the determination and based at least in part on a predetermined priority rule; and a component for receiving downlink communications from the transmit-receive point associated with the selected default beam.

[0012] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to: identify a first default beam for receiving downlink transmissions from a first transmit-receive point and a second default beam for receiving downlink transmissions from a second transmit-receive point; determine that the first default beam and the second default beam cannot be received at the UE at the same time; in response to the determination and based at least in part on a predetermined priority rule, select one of the first default beam and the second default beam; and receive downlink communications from the transmit-receive point associated with the selected default beam.

[0013] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining that a first transmit-receive point is associated with a first control resource set group and a second transmit-receive point is associated with a second control resource set group, wherein the first control resource set group is associated with a first default beam and the second control resource set group is associated with a second default beam, and wherein a predetermined priority rule indicates which of the first control resource set group or the second control resource set group may have a higher priority. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the predetermined priority rule indicates a pre-specified priority of the first control resource set group and the second control resource set group.

[0014] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving an indication from the base station indicating which of the first control resource set group or the second control resource set group may have a higher priority. In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the indication from the base station is provided in a radio resource control transmission, a medium access control (MAC) control element, downlink control information, or any combination thereof.

[0015] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining one or more parameters for each of the first control resource set group and the second control resource set group, wherein the predetermined priority rule is based on the determined one or more parameters. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the one or more parameters include one or more of the number of control resource sets in each of the first control resource set group and the second control resource set group, a search space monitoring period for each of the first control resource set group and the second control resource set group, or any combination thereof.

[0016] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a predetermined priority rule indicates that a transmit-receive point associated with a switching operation may have a higher priority than other transmit-receive points.

[0017] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, a predetermined priority rule specifies that the priorities of different transmit-receive points can change based on one or more parameters. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the one or more parameters include transmission time slots, and wherein a first default beam of a first transmit-receive point is selected for a first subset of transmission time slots, and a second default beam of a second transmit-receive point is selected for a second subset of second transmission time slots. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the one or more parameters include a value of a control resource set identifier associated with each of the first transmit-receive point and the second transmit-receive point, and wherein the lowest valued control resource set identifier can have the highest priority, and the associated default transmission beam is selected for communication with the associated transmit-receive point.

[0018] Some examples of the methods, devices, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending an incompatible beam report to a serving base station indicating beams that cannot be simultaneously received at a UE.

[0019] A wireless communication method at a UE is described. The method may include: identifying a mapping between one or more control resource sets and one or more default beams of each of a first transmit-receive point and a second transmit-receive point, wherein the mapping indicates one or more default beams of the second transmit-receive point that allow simultaneous reception of downlink communications from two or more transmit-receive points; determining a first default beam of the first transmit-receive point; selecting a second default beam of the second transmit-receive point based on the mapping; and receiving simultaneous downlink communications from the first transmit-receive point using the first default beam and from the second transmit-receive point using the second default beam.

[0020] 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 executed by the processor to cause the apparatus to: identify a mapping between one or more control resource sets and one or more default beams for each of a first transmit-receive point and a second transmit-receive point, wherein the mapping indicates one or more default beams of the second transmit-receive point that allow simultaneous reception of downlink communications from two or more transmit-receive points; determine a first default beam for the first transmit-receive point; select a second default beam for the second transmit-receive point based on the mapping; and receive simultaneous downlink communications from the first transmit-receive point using the first default beam and from the second transmit-receive point using the second default beam.

[0021] Another apparatus for wireless communication at a UE is described. The apparatus may include: a component for identifying a mapping between one or more control resource sets and one or more default beams for each of a first transmit-receive point and a second transmit-receive point, wherein the mapping indicates one or more default beams of the second transmit-receive point that allow simultaneous reception of downlink communications from two or more transmit-receive points; a component for determining a first default beam for the first transmit-receive point; a component for selecting a second default beam for the second transmit-receive point based on the mapping; and a component for receiving simultaneous downlink communications from the first transmit-receive point using the first default beam and from the second transmit-receive point using the second default beam.

[0022] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to: identify a mapping between one or more control resource sets and one or more default beams for each of a first transmit-receive point and a second transmit-receive point, wherein the mapping indicates one or more default beams of the second transmit-receive point that allow simultaneous reception of downlink communications from two or more transmit-receive points; determine a first default beam for the first transmit-receive point; select a second default beam for the second transmit-receive point based on the mapping; and receive simultaneous downlink communications from the first transmit-receive point using the first default beam and from the second transmit-receive point using the second default beam.

[0023] In some examples of methods, apparatus, and non-transitory computer-readable media described herein, a mapping indicates a first subset of control resource sets for a first transmit-receive point and a second subset of control resource sets for a second transmit-receive point, each control resource set having an associated default beam, and wherein the first subset of control resource sets and the second subset of control resource sets do not overlap, and the first default beam is determined based on the first subset of control resource sets and the second default beam is determined based on the second subset of control resource sets. Some examples of methods, apparatus, and non-transitory computer-readable media described herein may simultaneously receive at a UE any default beam associated with the first subset of control resource sets and any default beam associated with the second subset of control resource sets.

[0024] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a first default beam for a first transmit-receive point is determined based on a control resource set received on a downlink control channel at the UE, and a second default beam is mapped to the first default beam.

[0025] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the mapping specifies that the second default beam does not correspond to any configured set of control resources of the first transmit-receive point.

[0026] A method for wireless communication at a UE is described. The method may include: receiving configuration information from a base station, the configuration information indicating a first default beam for receiving downlink transmissions from a first transmit-receive point and a second default beam for receiving downlink transmissions from a second transmit-receive point, wherein one or more of the first default beam or the second default beam is independent of an associated control transmission beam for transmitting control information to the UE; identifying that a time offset between a physical downlink control channel transmission and a physical downlink shared channel transmission of each of the first transmit-receive point and the second transmit-receive point is below a threshold; and based on identifying that the time offset is below the threshold, simultaneously receiving the first default beam from the first transmit-receive point and the second default beam from the second transmit-receive point.

[0027] A device for wireless communication at a UE is described, and the device may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executed by the processor to cause the device to: receive configuration information from a base station, the configuration information indicating a first default beam for receiving downlink transmissions from a first transmit-receive point and a second default beam for receiving downlink transmissions from a second transmit-receive point, wherein one or more of the first default beam or the second default beam is independent of an associated control transmission beam for transmitting control information to the UE; identify that a time offset between a physical downlink control channel transmission and a physical downlink shared channel transmission of each of the first transmit-receive point and the second transmit-receive point is below a threshold; and based on identifying that the time offset is below the threshold, simultaneously receive the first default beam from the first transmit-receive point and the second default beam from the second transmit-receive point.

[0028] Another apparatus for wireless communication at a UE is described. The apparatus may include: a component for receiving configuration information from a base station, the configuration information indicating a first default beam for receiving downlink transmissions from a first transmit-receive point and a second default beam for receiving downlink transmissions from a second transmit-receive point, wherein one or more of the first default beam or the second default beam is independent of an associated control transmission beam for transmitting control information to the UE; a component for identifying that a time offset between a physical downlink control channel transmission and a physical downlink shared channel transmission of each of the first transmit-receive point and the second transmit-receive point is below a threshold; and a component for simultaneously receiving the first default beam from the first transmit-receive point and the second default beam from the second transmit-receive point based on identifying that the time offset is below the threshold.

[0029] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to: receive configuration information from a base station, the configuration information indicating a first default beam for receiving downlink transmissions from a first transmission-reception point and a second default beam for receiving downlink transmissions from a second transmission-reception point, wherein one or more of the first default beam or the second default beam is independent of an associated control transmission beam for transmitting control information to the UE; identify that a time offset between a physical downlink control channel transmission and a physical downlink shared channel transmission of each of the first transmission-reception point and the second transmission-reception point is below a threshold; and based on identifying that the time offset is below the threshold, simultaneously receive the first default beam from the first transmission-reception point and the second default beam from the second transmission-reception point. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the configuration information from the base station is received in a medium access control (MAC) control element (CE). In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the same MAC-CE indicates both the first default beam and the second default beam.

[0030] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first default beam is determined based on an associated control transmission beam of the first transmit-receive point, and the second default beam is explicitly indicated in the configuration information.

[0031] A method for wireless communication at a base station is described. The method may include: identifying a first default beam for sending a first downlink communication from a first transmit-receive point to a UE and a second default beam for sending a second downlink communication from a second transmit-receive point to the UE; determining that the first default beam and the second default beam cannot be received at the UE at the same time; and in response to the determination and based on a predetermined priority rule, scheduling the first transmit-receive point to send the first downlink communication using the first default beam, and scheduling the second transmit-receive point to send the second downlink communication using a second beam different from the second default beam, wherein the scheduling is for receiving the first downlink communication and the second downlink communication at the UE at the same time.

[0032] 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 executed by the processor to cause the apparatus to: identify a first default beam for sending a first downlink communication from a first transmit-receive point to a UE and a second default beam for sending a second downlink communication from a second transmit-receive point to the UE; determine that the first default beam and the second default beam cannot be received simultaneously at the UE; and in response to the determination and based on a predetermined priority rule, schedule the first transmit-receive point to send the first downlink communication using the first default beam, and schedule the second transmit-receive point to send the second downlink communication using a second beam different from the second default beam, wherein the scheduling is for receiving the first downlink communication and the second downlink communication simultaneously at the UE.

[0033] Another apparatus for wireless communication at a base station is described. The apparatus may include: a component for identifying a first default beam for transmitting a first downlink communication from a first transmit-receive point to a UE and a second default beam for transmitting a second downlink communication from a second transmit-receive point to the UE; a component for determining that the first default beam and the second default beam cannot be received simultaneously at the UE; and a component for, in response to the determination and based on a predetermined priority rule, scheduling the first transmit-receive point to transmit the first downlink communication using the first default beam and scheduling the second transmit-receive point to transmit the second downlink communication using a second beam different from the second default beam, wherein the scheduling is for receiving the first downlink communication and the second downlink communication simultaneously at the UE.

[0034] A non-transitory computer-readable medium storing code for wireless communication at a base station is described. The code may include instructions executable by a processor to: identify a first default beam for sending a first downlink communication from a first transmit-receive point to a UE and a second default beam for sending a second downlink communication from a second transmit-receive point to the UE; determine that the first default beam and the second default beam cannot be received at the UE at the same time; and in response to the determination and based on a predetermined priority rule, schedule the first transmit-receive point to send the first downlink communication using the first default beam, and schedule the second transmit-receive point to send the second downlink communication using a second beam different from the second default beam, wherein the scheduling is for receiving the first downlink communication and the second downlink communication at the UE at the same time.

[0035] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining that a first transmit-receive point is associated with a first control resource set group and a second transmit-receive point is associated with a second control resource set group, wherein the first control resource set group is associated with a first default beam and the second control resource set group is associated with a second default beam, wherein a predetermined priority rule indicates which of the first control resource set group or the second control resource set group has a higher priority. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the predetermined priority rule indicates a pre-specified priority of the first control resource set group and the second control resource set group. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending an indication to a UE indicating which of the first control resource set group or the second control resource set group has a higher priority.

[0036] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining one or more parameters for each of the first control resource set group and the second control resource set group, wherein the predetermined priority rule is based on the determined one or more parameters. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the one or more parameters include one or more of the number of control resource sets in each of the first control resource set group and the second control resource set group, the search space monitoring period in each of the first control resource set group and the second control resource set group, or any combination thereof.

[0037] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, a predetermined priority rule specifies that priorities of different transmit-receive points may vary based on one or more parameters. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the one or more parameters include transmission time slots, and wherein a first default beam of a first transmit-receive point is selected for a first subset of transmission time slots, and a second default beam of a second transmit-receive point is selected for a second subset of transmission time slots. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the one or more parameters include a value of a control resource set identifier associated with each of the first transmit-receive point and the second transmit-receive point, and wherein the lowest valued control resource set identifier may have the highest priority, and the associated default transmission beam is selected for communication with the associated transmit-receive point.

[0038] A method for wireless communication at a base station is described. The method may include: identifying a mapping between one or more control resource sets and one or more default beams for each of a first transmit-receive point and a second transmit-receive point, wherein the mapping indicates one or more default beams of the second transmit-receive point that allow downlink communications from two or more transmit-receive points to be received simultaneously at a UE; determining a first default beam for the first transmit-receive point; selecting a second default beam for the second transmit-receive point based on the mapping; and in response to the determination and the selection, scheduling the first transmit-receive point to send a first downlink communication using the first default beam, and scheduling the second transmit-receive point to send a second downlink communication beam using a second beam different from the second default beam, wherein the scheduling is for receiving the first downlink communication and the second downlink communication simultaneously at the UE.

[0039] 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 executed by the processor to cause the apparatus to: identify a mapping between one or more control resource sets and one or more default beams for each of a first transmit-receive point and a second transmit-receive point, wherein the mapping indicates one or more default beams of the second transmit-receive point that allow downlink communications from two or more transmit-receive points to be received simultaneously at a UE; determine a first default beam for the first transmit-receive point; select a second default beam for the second transmit-receive point based on the mapping; and in response to the determination and selection, schedule the first transmit-receive point to send a first downlink communication using the first default beam, and schedule the second transmit-receive point to send a second downlink communication beam using a second beam different from the second default beam, wherein the scheduling is for receiving the first downlink communication and the second downlink communication simultaneously at the UE.

[0040] Another apparatus for wireless communication at a base station is described. The apparatus may include: a component for identifying a mapping between one or more control resource sets and one or more default beams for each of a first transmit-receive point and a second transmit-receive point, wherein the mapping indicates one or more default beams of the second transmit-receive point that allow downlink communications from two or more transmit-receive points to be received simultaneously at a UE; a component for determining a first default beam for the first transmit-receive point; a component for selecting a second default beam for the second transmit-receive point based on the mapping; and a component for, in response to the determination and the selection, scheduling the first transmit-receive point to send a first downlink communication using the first default beam and scheduling the second transmit-receive point to send a second downlink communication beam using a second beam different from the second default beam, wherein the scheduling is for receiving the first downlink communication and the second downlink communication simultaneously at the UE.

[0041] A non-transitory computer-readable medium storing code for wireless communication at a base station is described. The code may include instructions executable by a processor to: identify a mapping between one or more control resource sets and one or more default beams for each of a first transmit-receive point and a second transmit-receive point, wherein the mapping indicates one or more default beams of the second transmit-receive point that allow downlink communications from two or more transmit-receive points to be received simultaneously at a UE; determine a first default beam for the first transmit-receive point; select a second default beam for the second transmit-receive point based on the mapping; and in response to the determination and the selection, schedule the first transmit-receive point to send a first downlink communication using the first default beam, and schedule the second transmit-receive point to send a second downlink communication beam using a second beam different from the second default beam, wherein the scheduling is for receiving the first downlink communication and the second downlink communication simultaneously at the UE.

[0042] In some examples of methods, apparatus, and non-transitory computer-readable media described herein, a mapping indicates a first subset of control resource sets for a first transmit-receive point and a second subset of control resource sets for a second transmit-receive point, each control resource set having an associated default beam, and wherein the first subset of control resource sets and the second subset of control resource sets do not overlap, and a first default beam is determined based on the first subset of control resource sets, and a second default beam is determined based on the second subset of control resource sets. Some examples of methods, apparatus, and non-transitory computer-readable media described herein may simultaneously receive at a UE any default beam associated with the first subset of control resource sets and any default beam associated with the second subset of control resource sets.

[0043] In some examples of methods, apparatuses, and non-transitory computer-readable media described herein, a first default beam for a first transmit-receive point is determined based on a control resource set received on a downlink control channel at the UE, and a second default beam is mapped to the first default beam. In some examples of methods, apparatuses, and non-transitory computer-readable media described herein, the mapping specifies that the second default beam does not correspond to any configured control resource set of the first transmit-receive point.

[0044] A method for wireless communication at a base station is described. The method may include: sending configuration information to a UE, the configuration information indicating a first default beam for receiving downlink communications from a first transmit-receive point and a second default beam for receiving downlink communications from a second transmit-receive point, wherein one or more of the first default beam or the second default beam is independent of an associated control transmission beam for transmitting control information to the UE; identifying that a time offset between a physical downlink control channel communication and a physical downlink shared channel communication of each of the first transmit-receive point and the second transmit-receive point is below a threshold; and in response to the identification, scheduling the first transmit-receive point to transmit the first downlink communication using the first default beam and scheduling the second transmit-receive point to transmit the second downlink communication using the second default beam, wherein the scheduling is for receiving the first downlink communication and the second downlink communication simultaneously at the UE.

[0045] 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 executed by the processor to cause the apparatus to: send configuration information to a UE, the configuration information indicating a first default beam for receiving downlink communications from a first transmit-receive point and a second default beam for receiving downlink communications from a second transmit-receive point, wherein one or more of the first default beam or the second default beam is independent of an associated control transmission beam for transmitting control information to the UE; identify that a time offset between a physical downlink control channel communication and a physical downlink shared channel communication of each of the first transmit-receive point and the second transmit-receive point is below a threshold; and in response to the identification, schedule the first transmit-receive point to send a first downlink communication using the first default beam and schedule the second transmit-receive point to send a second downlink communication using the second default beam, wherein the scheduling is for simultaneously receiving the first downlink communication and the second downlink communication at the UE.

[0046] Another apparatus for wireless communication at a base station is described. The apparatus may include: a component for sending configuration information to a UE, the configuration information indicating a first default beam for receiving downlink communications from a first transmit-receive point and a second default beam for receiving downlink communications from a second transmit-receive point, wherein one or more of the first default beam or the second default beam is independent of an associated control transmission beam for transmitting control information to the UE; a component for identifying that a time offset between a physical downlink control channel communication and a physical downlink shared channel communication of each of the first transmit-receive point and the second transmit-receive point is below a threshold; and a component for scheduling the first transmit-receive point to send a first downlink communication using the first default beam and scheduling the second transmit-receive point to send a second downlink communication using the second default beam in response to the identification, wherein the scheduling is for receiving the first downlink communication and the second downlink communication at the UE simultaneously.

[0047] A non-transitory computer-readable medium storing code for wireless communication at a base station is described. The code may include instructions executable by a processor to: send configuration information to a UE, the configuration information indicating a first default beam for receiving downlink communications from a first transmit-receive point and a second default beam for receiving downlink communications from a second transmit-receive point, wherein one or more of the first default beam or the second default beam is independent of an associated control transmission beam for transmitting control information to the UE; identify that a time offset between a physical downlink control channel communication and a physical downlink shared channel communication of each of the first transmit-receive point and the second transmit-receive point is below a threshold; and in response to identifying, schedule the first transmit-receive point to send a first downlink communication using the first default beam and schedule the second transmit-receive point to send a second downlink communication using the second default beam, wherein the scheduling is for receiving the first downlink communication and the second downlink communication simultaneously at the UE.

[0048] In some examples of methods, apparatuses, and non-transitory computer-readable media described herein, the configuration information from the base station is transmitted in a medium access control (MAC) control element (CE). In some examples of methods, apparatuses, and non-transitory computer-readable media described herein, the same MAC-CE indicates both the first default beam and the second default beam.

[0049] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first default beam is determined based on an associated control transmission beam of the first transmit-receive point, and the second default beam is explicitly indicated in the configuration information. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] 1 illustrates an example of a wireless communication system supporting a default transmission beam for multiple transmission-reception points in wireless communication according to aspects of the present disclosure.

[0051] 2 illustrates an example of a portion of a wireless communication system supporting a default transmission beam for multiple transmit-receive points in wireless communication according to aspects of the present disclosure.

[0052] 3 illustrates an example of a CORESET supporting UE monitoring of a default transmission beam for multiple transmit-receive points in wireless communication according to aspects of the present disclosure.

[0053] 4 illustrates an example of a wireless communication system supporting a default transmission beam for multiple transmit-receive points in wireless communication according to aspects of the present disclosure.

[0054] 5 illustrates an example of a process flow for supporting a default transmission beam for multiple transmit-receive points in wireless communications according to aspects of the present disclosure.

[0055] 6 and 7 illustrate block diagrams of devices supporting a default transmission beam for multiple transmission-reception points in wireless communication according to aspects of the present disclosure.

[0056] 8 illustrates a block diagram of a communication manager supporting a default transmission beam for multiple transmit-receive points in wireless communications in accordance with aspects of the present disclosure.

[0057] 9 illustrates a diagram of a system including a device supporting a default transmission beam for multiple transmit-receive points in wireless communication according to aspects of the present disclosure.

[0058] 10 and 11 illustrate block diagrams of devices supporting a default transmission beam for multiple transmission-reception points in wireless communication according to aspects of the present disclosure.

[0059] 12 illustrates a block diagram of a communication manager supporting a default transmission beam for multiple transmit-receive points in wireless communications in accordance with aspects of the present disclosure.

[0060] 13 illustrates a diagram of a system including a device supporting a default transmission beam for multiple transmit-receive points in wireless communication according to aspects of the present disclosure.

[0061] 14 to 20 show flow charts illustrating methods of supporting a default transmission beam for multiple transmission-reception points in wireless communication according to aspects of the present disclosure. DETAILED DESCRIPTION

[0062] Various provided techniques relate to default transmission beams for multiple transmit-receive points (TRPs) in wireless communications. According to various aspects, techniques are described for providing a default beam for two or more TRPs for downlink communications simultaneously received at a user equipment (UE). In some cases, the UE may receive a physical downlink control channel (PDCCH) transmission from a TRP, including control information for decoding a subsequent physical downlink shared channel (PDSCH) transmission from the TRP. The UE may decode the control information before receiving the PDSCH transmission and use the control information to configure one or more parameters for receiving and / or decoding the PDSCH transmission. In some cases, the TRP may transmit the PDSCH transmission close in time to the PDCCH transmission or overlap with the PDCCH transmission. If the offset between the PDCCH transmission and the PDSCH transmission is below a time threshold, the UE may not be able to decode the control information in the PDCCH with sufficient time to configure its reception parameters to receive and decode the PDSCH transmission. Therefore, when the UE receives and decodes the PDCCH control information, the UE and the TRP may configure a default reception beam for buffering the PDSCH transmission. In some cases, a TRP may be configured with one or more control resource sets (CORESETs) that identify radio resources that may carry downlink control information, and the default beam for the TRP may be determined to be the beam associated with the CORESET with the lowest CORESET ID in the CORESET group.

[0063] However, in some cases, multiple TRPs may be configured for simultaneous transmissions to a UE, where the UE will receive multiple transmissions from multiple TRPs simultaneously. In this case, selecting a default beam for each TRP may result in incompatible beams that the UE cannot receive simultaneously. For example, a UE that is to receive simultaneous downlink transmissions from multiple TRPs may use multiple antenna panels that may each be capable of receiving one beam at a time, so if two TRPs have a default beam that uses the same antenna panel at the UE, the UE will not be able to receive both default beams simultaneously.

[0064] According to various aspects of the present disclosure, in order to allow such a UE to simultaneously receive multiple transmissions from different TRPs via associated default beams, the default beams may be configured such that the UE is able to receive each default beam. In some cases, a default beam may be determined for each of a plurality of TRPs, and in the case where the default beams are incompatible, the UE and the TRP may apply a priority rule to determine which TRP uses the initially determined default beam, while other TRPs (or multiple) may use a beam different from the initially determined default beam. Such a priority rule may be a pre-configured rule that may be signaled by a serving base station (e.g., via radio resource control (RRC) signaling, a media access control (MAC) control element (CE), downlink control information (DCI), or any combination thereof). In other cases, a CORESET subset for each TRP may be configured for the UE such that beams associated with differently configured subsets are compatible and can be received simultaneously at the UE. In other cases, a first beam for a first TRP may be determined based on the lowest CORESET ID of the first TRP, and then a second beam for a second TRP may be determined based on a mapping to the first beam. In a further case, the serving base station may explicitly configure a default beam for one or more TRPs in order to provide compatible beams from each TRP.

[0065] Such techniques may support communication between a UE and multiple TRPs to improve throughput or to improve reliability of communication. For example, when operating in a multi-TRP operation mode, a UE may receive different downlink data from multiple TRPs simultaneously, thereby improving throughput, or a UE may receive the same downlink data from multiple TRPs, thereby improving reliability (e.g., a higher probability that the UE will receive the data). Techniques as discussed herein may further enhance such reliability, throughput, or both.

[0066] Various aspects of the present disclosure are initially described in the context of a wireless communication system. Examples of processes and signaling exchanges that support default beam determination for multiple TRP configurations are then described. Various aspects of the present disclosure are further illustrated and described by apparatus diagrams, system diagrams, and flow charts related to default transmission beams for multiple transmit-receive points in wireless communication.

[0067] 1 illustrates an example of a wireless communication system 100 that supports a default transmission beam for multiple transmit-receive points in wireless communication according to aspects of the present disclosure. The wireless communication system 100 includes a base station 105, a UE 115, and a core network 130. In some examples, the wireless communication system 100 may be a long term evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, or a new radio (NR) network. In some cases, 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.

[0068] The base station 105 can communicate wirelessly with the UE 115 via one or more base station antennas. The base station 105 described herein may include or may be referred to by those skilled in the art as a base transceiver, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB), a next generation NodeB or a giga-NodeB (both of which may be referred to as gNB), a Home NodeB, a Home eNodeB, or some other suitable terminology. The wireless communication system 100 may include different types of base stations 105 (e.g., macro cell base stations or small cell base stations). The UE 115 described herein is capable of communicating with various types of base stations 105 and network devices including macro eNBs, small cell eNBs, gNBs, relay base stations, etc.

[0069] Each base station 105 may be associated with a particular geographic coverage area 110 that supports communications with various UEs 115. Each base station 105 may provide communication coverage for a corresponding geographic coverage area 110 via a communication link 125, and the communication link 125 between the base station 105 and the UE 115 may utilize one or more carriers. The communication link 125 shown in the wireless communication system 100 may include an uplink transmission from the UE 115 to the base station 105, or a downlink transmission from the base station 105 to the UE 115. Downlink transmissions may also be referred to as forward link transmissions, and uplink transmissions may also be referred to as reverse link transmissions.

[0070] The geographic coverage area 110 of the base station 105 can be divided into sectors that constitute a portion of the geographic coverage area 110, and each sector can be associated with a cell. For example, each base station 105 can provide communication coverage for a macro cell, a small cell, a hotspot, or other type of cell, or various combinations thereof. In some examples, the base station 105 can be mobile and thus provide communication coverage for a mobile geographic coverage area 110. In some examples, different geographic coverage areas 110 associated with different technologies can overlap, and overlapping geographic coverage areas 110 associated with different technologies can be supported by the same base station 105 or different base stations 105. The wireless communication system 100 may include, for example, a heterogeneous LTE / LTE-A / LTE-A Pro or NR network, in which different types of base stations 105 provide coverage 110 for various geographic coverage areas.

[0071] The term "cell" refers to a logical communication entity used to communicate with a base station 105 (e.g., by an operator), and may be associated with an identifier (e.g., a physical cell identifier (PCID), a virtual cell identifier (VCID)) used to distinguish between adjacent cells operating through the same or different carriers. In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types that may provide access rights to different types of devices (e.g., machine type communication (MTC), narrowband Internet of Things (NB-IoT), enhanced mobile broadband (eMBB), etc.). In some cases, the term "cell" may refer to a portion of a geographic coverage area 110 (e.g., a sector) on which the logical entity operates.

[0072] UE 115 may be dispersed throughout the wireless communication system 100, and each UE 115 may be fixed or mobile. UE 115 may also be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable term, where "device" may also be referred to as a unit, a station, a terminal, or a client. UE 115 may also be a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 may also refer to a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or an MTC device, etc., which may be implemented in various items, such as appliances, vehicles, meters, etc.

[0073] Some UEs 115, such as MTC or IoT devices, may be low-cost or low-complexity devices and may provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC may refer to data communication technology that allows devices to communicate with each other or with a base station 105 without human intervention. In some examples, M2M communication or MTC may include communications from devices that integrate sensors or meters to measure or capture information and relay that information to a central server or application that may utilize the information or present the information to a person interacting with the program or application. Some UEs 115 may be designed to collect information or enable automated behavior of machines. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business charging.

[0074] Some UEs 115 may be configured to employ a reduced power consumption mode of operation, such as half-duplex communication (e.g., a mode that supports one-way communication via transmission or reception but not simultaneous transmission and reception). In some examples, half-duplex communication may be performed at a reduced peak rate. Other power saving techniques for the UE 115 include entering a power saving "deep sleep" mode when not engaged in active communications, or operating over limited bandwidth (e.g., in accordance with narrowband communications). In some cases, the UE 115 may be designed to support critical functions (e.g., mission critical functions), and the wireless communication system 100 may be configured to provide ultra-reliable communications for these functions.

[0075] In some cases, UE 115 can also communicate directly with other UE 115 (e.g., using peer-to-peer (P2P) or device-to-device (D2D) protocols). One or more of a group of UE 115 utilizing D2D communication may be within the geographic coverage area 110 of the base station 105. Other UE 115 in such a group may be outside the geographic coverage area 110 of the base station 105, or in other cases, unable to receive transmissions from the base station 105. In some cases, a group of UE 115 communicating via D2D communication may utilize a one-to-many (1:M) system, in which each UE 115 transmits to each other UE 115 in the group. In some cases, the base station 105 facilitates scheduling of resources for D2D communication. In other cases, D2D communication is performed between UE 115 without involving the base station 105.

[0076] The base stations 105 may communicate with the core network 130 and with each other. For example, the base stations 105 may interface with the core network 130 via a backhaul link 132 (e.g., via an S1, N2, N3, or other interface). The base stations 105 may communicate with each other directly (e.g., directly between the base stations 105) or indirectly (e.g., through the core network 130) via a backhaul link 134 (e.g., via an X2, Xn, or other interface).

[0077] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC), which may include at least one mobility management entity (MME), at least one serving gateway (S-GW), and at least one packet data network (PDN) gateway (PGW). The MME may manage non-access stratum (e.g., control plane) functions such as mobility, authentication, and bearer management for UEs 115 served by base stations 105 associated with the EPC. User IP packets may be transmitted through the S-GW, which itself may be connected to the P-GW. The P-GW may provide IP address allocation and other functions. The P-GW may be connected to network operator IP services. Operator IP services may include access to the Internet, an intranet, an IP multimedia subsystem (IMS), or a packet switched (PS) streaming service.

[0078] At least some network devices, such as base stations 105, may include subcomponents, such as access network entities, which may be examples of access node controllers (ANCs). Each access network entity may communicate with UE 115 through multiple other access network transport entities, which may be referred to as radio heads, smart radio heads, or TRPs. In some configurations, the various functions of each access network entity or base station 105 may be distributed across various network devices (e.g., radio heads and access network controllers) or merged into a single network device (e.g., base station 105).

[0079] The wireless communication system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Typically, the region from 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features. However, the waves may penetrate structures sufficiently for a macro cell to provide service to a UE 115 located indoors. Transmissions using UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 km) than transmissions using smaller frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0080] The wireless communication system 100 may also operate in the Super High Frequency (SHF) region using frequency bands from 3 GHz to 30 GHz (also referred to as centimeter bands). The SHF region includes bands such as the 5 GHz Industrial, Scientific, and Medical (ISM) band, which may be used from time to time by devices that can tolerate interference from other users.

[0081] The wireless communication system 100 may also operate in the extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz), also known as the millimeter wave band. In some examples, the wireless communication system 100 may support millimeter wave (mmW) communications between the UE 115 and the base station 105, and the EHF antennas of the individual devices may be smaller and more closely spaced than the UHF antennas. In some cases, this may facilitate the use of antenna arrays within the UE 115. However, the propagation of EHF transmissions may experience greater atmospheric attenuation and a shorter range than SHF or UHF transmissions. The techniques disclosed herein may be used for transmissions across one or more different frequency regions, and the designated use of frequency bands across these frequency regions may vary by country or regulatory agency.

[0082] In some cases, the wireless communication system 100 may use licensed radio spectrum bands and unlicensed radio spectrum bands. For example, the wireless communication system 100 may employ licensed assisted access (LAA), LTE-unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band such as a 5GHz ISM band. When operating in an unlicensed radio spectrum band, wireless devices such as base stations 105 and UE 115 may employ a listen-before-talk (LBT) procedure to ensure that the channel is idle before transmitting data. In some cases, operations in unlicensed bands may be based on carrier aggregation configuration in conjunction with component carriers operating in licensed bands (e.g., LAA). Operations in unlicensed spectrum may include downlink transmissions, uplink transmissions, peer-to-peer transmissions, or a combination of these. Duplexing in unlicensed spectrum may be based on frequency division duplexing (FDD), time division duplexing (TDD), or a combination of both.

[0083] In some examples, the base station 105 or UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. For example, the wireless communication system 100 may use a transmission scheme between a transmitting device (e.g., base station 105) and a receiving device (e.g., UE 115), wherein the transmitting device is equipped with multiple antennas and the receiving device is equipped with one or more antennas. MIMO communication may employ multipath signal propagation to improve spectral efficiency by transmitting or receiving multiple signals via different spatial layers, which may be referred to as spatial multiplexing. For example, multiple signals may be transmitted by a transmitting device via different antennas or different antenna combinations. Similarly, multiple signals may be received by a receiving device via different antennas or different antenna combinations. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams. Different spatial layers may be associated with different antenna ports for channel measurement and reporting. MIMO technology includes single-user MIMO (SU-MIMO) that sends multiple spatial layers to the same receiving device, and multi-user MIMO (MU-MIMO) that sends multiple spatial layers to multiple devices.

[0084] Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105 or a UE 115) to shape or steer an antenna beam (e.g., a transmit beam or a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals transmitted via antenna elements of an antenna array such that signals propagating at a particular orientation relative to the antenna array experience constructive interference and other signals experience destructive interference. Adjustments to signals transmitted via antenna elements may include the transmitting device or the receiving device applying particular amplitude and phase offsets to signals carried via each antenna element associated with the device. Adjustments associated with each antenna element may be defined by a set of beamforming weights associated with a particular orientation (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other orientation).

[0085] In one example, the base station 105 may use multiple antennas or antenna arrays to perform beamforming operations for directional communications with the UE 115. For example, some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted multiple times by the base station 105 in different directions, which may include signals transmitted according to different beamforming weight sets associated with different transmission directions. Transmissions along different beam directions may be used to identify (e.g., by the base station 105 or a receiving device such as the UE 115) the beam direction for subsequent transmissions and / or receptions with respect to the base station 105.

[0086] Some signals, such as data signals associated with a particular receiving device, may be transmitted by base station 105 in a single beam direction (e.g., a direction associated with a receiving device such as UE 115). In some examples, the beam direction associated with transmission along a single beam direction may be determined based at least in part on signals transmitted in different beam directions. For example, UE 115 may receive one or more signals transmitted by base station 105 in different directions, and UE 115 may report to base station 105 an indication of the signal it received with the highest signal quality, or otherwise an acceptable signal quality. 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 a beam direction for subsequent transmission or reception by UE 115), or to transmit signals in a single direction (e.g., for transmitting data to a receiving device).

[0087] A receiving device (e.g., UE 115, which may be an example of a millimeter wave receiving device) may try multiple receive beams when receiving various signals from base station 105, such as synchronization signals, reference signals, beam selection signals, or other control signals. For example, the receiving device may try multiple receive directions by receiving via different antenna subarrays, by processing received signals according to different antenna subarrays, by receiving according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, or by processing received signals according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as "listening" according to different receive beams or receive directions. In some examples, the receiving device may receive along a single beam direction using a single receive beam (e.g., when receiving data signals). The single receive beam may be aligned in a beam direction determined based at least in part on listening according to different receive beam directions (e.g., a beam direction determined to have the highest signal strength, the highest signal-to-noise ratio, or other acceptable signal quality based at least in part on listening according to multiple beam directions).

[0088] In some cases, the antennas of a base station 105 or a UE 115 may be located within one or more antenna arrays that may support MIMO operations 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 cases, the antennas or antenna arrays associated with a base station 105 may be located at different geographic locations. A base station 105 may have an antenna array with multiple rows and columns of antenna ports that the base station 105 may use to support beamforming for communications with a UE 115. Likewise, a UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations.

[0089] In some cases, the wireless communication system 100 may be a packet-based network operating according to a layered protocol stack. In the user plane, the communication of the bearer or packet data convergence protocol (PDCP) layer may be IP-based. The radio link control (RLC) layer may perform packet segmentation and reassembly to communicate over logical channels. The media access control (MAC) layer may perform priority processing and multiplex logical channels into transport channels. The MAC layer may also use hybrid automatic repeat request (HARQ) to provide retransmission at the MAC layer to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer may provide the establishment, configuration, and maintenance of an RRC connection between a UE 115 and a base station 105 or a core network 130 supporting a radio bearer for user plane data. At the physical layer, transport channels may be mapped to physical channels.

[0090] The time interval in LTE or NR can be expressed as a multiple of the basic time unit, for example, T s = 1 / 30,720,000 seconds. The time intervals of the communication resources may be organized according to radio frames each having a duration of 10 milliseconds (ms), where the frame period may be denoted as T f = 307,200 T s. A radio frame may be identified by a system frame number (SFN) ranging from 0 to 1023. Each frame may include 10 subframes numbered from 0 to 9, and each subframe may have a duration of 1 ms. A subframe may be further divided into 2 slots, each slot having a duration of 0.5 ms, and each slot may contain 6 or 7 modulation symbol periods (e.g., depending on the length of the cyclic prefix preceding each symbol period). Excluding the cyclic prefix, each symbol period may contain 2048 sampling periods. In some cases, a subframe may be the smallest scheduling unit of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In other cases, the smallest scheduling unit of the wireless communication system 100 may be shorter than a subframe or may be dynamically selected (e.g., in a burst of a shortened TTI (sTTI) or in a selected component carrier using sTTI).

[0091] In some wireless communication systems, a time slot may be further divided into a plurality of mini slots containing one or more symbols. In some cases, a symbol of a mini slot or a mini slot may be the smallest unit of scheduling. For example, the duration of each symbol may vary depending on the subcarrier spacing or the operating frequency band. In addition, some wireless communication systems may implement time slot aggregation, where multiple time slots or mini slots are aggregated together and used for communication between UE 115 and base station 105.

[0092] The term "carrier" refers to a set of radio frequency spectrum resources with a defined physical layer structure for supporting communications on the communication link 125. For example, a carrier of the communication link 125 may include a portion of a radio frequency spectrum band, operating according to a physical layer channel of a given radio access technology. Each physical layer channel may carry user data, control information, or other signaling. A carrier may be associated with a predefined frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and may be located according to a channel raster for UE 115 discovery. A carrier may be downlink or uplink (e.g., in FDD mode), or configured to carry downlink and uplink communications (e.g., in TDD mode). In some examples, a signal waveform transmitted on a carrier may be composed of multiple subcarriers (e.g., using a multi-carrier modulation (MCM) technique such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)).

[0093] The organization structure of the carrier may be different for different radio access technologies (e.g., LTE, LTE-A, LTE-A Pro, NR). For example, the communication on the carrier can be organized according to TTI or time slots, and each TTI or time slot can include user data and control information or signaling to support decoding of the user data. The carrier may also include dedicated acquisition signaling (e.g., synchronization signals or system information, etc.) and control signaling to coordinate the operation of the carrier. In some examples (e.g., in a carrier aggregation configuration), the carrier may also have acquisition signaling or control signaling to coordinate the operation of other carriers.

[0094] Physical channels may be multiplexed on a carrier according to various techniques. Physical control channels and physical data channels may be multiplexed on a downlink carrier, for example, using a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique. In some examples, control information transmitted in a physical control channel may be distributed in a cascaded manner between different control regions (e.g., between a common control region or common search space and one or more UE-specific control regions or UE-specific search spaces).

[0095] A carrier may be associated with a particular bandwidth of the radio spectrum, and in some examples, the carrier bandwidth may be referred to as the "system bandwidth" of the carrier or wireless communication system 100. For example, the carrier bandwidth may be one of a plurality of predetermined bandwidths of a carrier for a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz). In some examples, each served UE 115 may be configured to operate on part or all of the carrier bandwidth. In other examples, some UEs 115 may be configured to operate using a narrowband protocol type associated with a predefined portion or range (e.g., a set of subcarriers or RBs) within a carrier (e.g., an "in-band" deployment of a narrowband protocol type).

[0096] In a system using MIMO technology, a resource element may consist of a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period is inversely proportional to the subcarrier spacing. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme). Therefore, the more resource elements received by UE 115 and the higher the order of the modulation scheme, the higher the data rate of UE 115. In a MIMO system, wireless communication resources may refer to a combination of radio frequency spectrum resources, time resources, and space resources (e.g., space layers), and the use of multiple space layers may further increase the data rate for communicating with UE 115.

[0097] A device of the wireless communication system 100 (e.g., a base station 105 or a UE 115) may have a hardware configuration that supports communication on a specific carrier bandwidth, or may be configured to support communication on one of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 and / or a UE 115 that supports simultaneous communication via carriers associated with more than one different carrier bandwidths.

[0098] The wireless communication system 100 may support communication with the UE 115 on multiple cells or carriers, a feature which may be referred to as carrier aggregation or multi-carrier operation. Depending on the carrier aggregation configuration, the UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation may be used with both FDD and TDD component carriers.

[0099] In some cases, one or more base stations 105 may have one or more TRPs for communicating with UE 115. In some cases, a default beam for each of the multiple TRPs may be determined, and in the event that the default beams are incompatible (i.e., cannot be simultaneously received at UE 115), UE 115 and the TRPs may apply a prioritization rule to determine which TRP uses the initially determined default beam, while other TRPs may use beams different from the initially determined default beam associated with the TRP. Such a prioritization rule may be a pre-configured rule that may be signaled by the serving base station 105 (e.g., via RRC signaling, MAC-CE, DCI, or any combination thereof). In other cases, UE 115 may be configured with a subset of the CORESET for each TRP such that beams associated with different configured subsets are compatible and can be simultaneously received at UE 115. In other cases, a first beam for a first TRP may be determined based on the lowest CORESET ID of the first TRP, and then a second beam for a second TRP may be determined based on a mapping to the first beam. In further cases, the serving base station 105 may explicitly configure a default beam for one or more TRPs to provide a compatible default beam for each TRP.

[0100] 2 illustrates an example of a wireless communication system 200 that supports default transmission beams for multiple transmit-receive points in wireless communication according to aspects of the present disclosure. In some examples, the wireless communication system 200 may implement aspects of the wireless communication system 100.

[0101] In the example of FIG. 2 , the wireless communication system 200 supports communication between a UE 115-a and multiple TRPs 205. The wireless communication system 200 may support multiple PDCCHs based on multiple TRPs or multiple panel transmissions. In some cases, the multi-TRP communication may be intra-cell (e.g., where TRP 205-a and TRP 205-b are associated with the same cell ID), inter-cell (e.g., where TRP 205-a and TRP 205- b are associated with different cell IDs), or a combination thereof. In the example of FIG. 2 , the UE 115-a may receive an RRC configuration from a base station (e.g., via one or more TRPs 205), which may configure multi-TRP operation, where multiple simultaneous downlink transmissions from multiple TRPs 205 may be sent to the UE 115-a. In some cases, a default beam may be configured for the TRP 205, which may be used when a PDCCH transmission and a PDSCH transmission occur within a time threshold. In some cases, the default beam for the first TRP 205-a may be based on a configured CORESET or multiple CORESETs for which the first TRP may monitor control information. For example, the default beam may be determined based on the CORESET with the lowest CORESET ID, and the corresponding beamforming parameters may be derived using the transmission control indicator (TCI) state associated with the CORESET. For example, the default receive beam may be derived from the quasi-co-location (QCL) information of the identified CORESET. In some cases, each TRP 205 may be configured with a default beam configuration. The UE 115-a may determine the default receive beam parameters for each TRP 205 based on, for example, monitoring the CORESET of the TRP 205 in the most recent time slot. The UE 115-a may simultaneously receive a first downlink transmission from the first TRP 205-a and a second downlink transmission from the second TRP 205-b using the configured default receive beam.

[0102] As described above, in some cases, UE 115-a may not be able to receive a default receive beam simultaneously, such as if multiple default beams are associated with the same antenna panel. In some prior art techniques for determining a default beam using multi-DCI based m-TRP operation, a beam associated with a CORESET with the lowest coreset ID within each group of CORESETs at TRP 205 may be used to construct a default beam pair, which may be used for TDM / SDM / FDM based PDSCH reception. As indicated, such a default PDSCH beam may be used to receive the PDSCH when the scheduling offset between the scheduled DCI and the scheduled PDSCH is less than a beam switching delay threshold. In some cases, a multi-DCI m-TRP may be identified if an upper layer TRP index for each CORESET is configured and is different between the CORESETs in the "PDCCH-config". It is also noted that in some cases, the CORESET with the lowest CORESET ID of each group may also be included in the constraint in the most recent monitoring slot of the CORESET containing the group. However, the default beam pair with this rule may result in beams that UE 115-a cannot receive simultaneously. For example, CORESET 0 is recommended to be in group 0, and when CORESET 0 defines a default beam with group 0, it may be incompatible with CORESETs in other groups (e.g., for SDM-based PDSCH reception, they cannot be received simultaneously).

[0103] In order to provide each TRP 205 with beams that can be simultaneously received at the UE 115-a, in some cases, a default beam priority rule can be used in situations where the UE 115-a is unable to receive a simultaneous default beam based on the above-mentioned rule for determining a default beam (i.e., the beam associated with the lowest CORESET ID of the CORESET group configured for the TRP 205). In this case, each TRP 205 determines an initial default beam, where each beam in the pair is associated with the lowest CORESET within the CORESET group of the corresponding TRP 205. In the event that the beam pairs are incompatible, the priority rule can be used to determine which TRP 205 will use the initially determined default beam, and another TRP 205 can use a different beam that is compatible (e.g., based on the lowest CORESET with a compatible beam). In some cases, the priority rule can specify that a fixed group or TRP has a higher priority (e.g., it can be specified that the lowest TRP index value always has a higher priority).

[0104] In other cases, the fixed group may be dynamically indicated by the base station (e.g., via RRC / MAC-CE / DCI). In further cases, the fixed group may be determined based on specific rules, such as the group with more CORESETs or the group with the shortest search space monitoring period of the CORESETs. In still further cases, the fixed group may be used for a TRP 205 used by a source or target cell during a handover process. In further cases, the default beam may be dynamically changed between TRPs 205 based on rules, such as a first TRP 205-a default beam being prioritized in even timeslots, a second TRP 205-b default beam being prioritized in odd timeslots, or a beam associated with a lower CORESET ID being prioritized among incompatible CORESETs. In some cases, both the UE 115-a and the TRP 205 may use a prioritized default beam and another beam of another TRP that is compatible. In some cases, UE 115-a may identify incompatible beams and send a beam report regarding the incompatible beams, which the serving base station may use to schedule simultaneous transmissions using the beams that UE 115-a is to monitor.

[0105] In other cases, each TRP 205 may be configured with a subset of CORESETs having default beams that are compatible with the UE 115-a. For example, the UE 115-a may be configured with three CORESETs (e.g., CORESET 0 / 1 / 2) including group 0 associated with the first TRP 205-a and two CORESETs (e.g., CORESET 3 / 4) including group 1 associated with the second TRP 205-b. The default beam of the first TRP 205-a may only be associated with CORESET 0 / 1 / 2 of the first TRP 205-a and may only be associated with CORESET 3 / 4 of the second TRP 205-b (or a smaller subset, depending on the subset configuration derived from the default beams). In this case, the serving base station may configure the subsets of CORESETs so that the default beams in any combination are compatible.

[0106] In other cases, a compatible default beam for the second TRP 205-b may be determined based on a default beam for the first TRP 205-a. In this case, the first default beam for the first TRP 205-a may follow a lowest CORESET index within a CORESET (or CORESET subset), and an associated second default beam for the second TRP 205-a may be defined (e.g., based on a mapping between the first default beam and the second default beam, where the mapping may be signaled, pre-specified, etc. by a serving base station), where the first default beam and the second default beam are compatible for the UE 115-a. For example, if the first default beam for the first TRP 205-a is beam 0, the UE 115-a may automatically select beam 1 as the second default beam (e.g., based on a mapping), where beam 1 may not correspond to the lowest CORESET for the second TRP 205-b or to any CORESET for the second TRP 205-b.

[0107] In other cases, the default beam of each TRP 205 may be decoupled from the PDCCH beam of the TRP 205. In this case, the serving base station may signal the default beam (or beams) of each TRP and provide an explicit indication of the default beam to be used. In some cases, the indication of the configured default beam may be provided in signaling from the base station, such as in a MAC-CE, RRC signaling, and the like. In some cases, a single MAC-CE may indicate two default beams for two TRPs 205. In other cases, different MAC-CEs may indicate default beams for each TRP 205, respectively. In addition, in some cases, the default beam of the first TRP 205-a may be determined based on the lowest CORESET ID, and the default beam of the second TRP 205-b may be indicated by a MAC-CE or other signaling from the base station.

[0108] FIG. 3 illustrates an example of a CORESET 300 monitored by a UE to support a default transmission beam for multiple transmit-receive points in wireless communication according to aspects of the present disclosure. In some examples, the CORESET 300 may be implemented in aspects of the wireless communication system 100 or 200. In this example, the CORESET 300 may be monitored by the UE for control information from multiple TRPs according to aspects of the present disclosure. For example, the UE may monitor a CORESET 305 (e.g., with IDs #0 and #1) for control information of a first TRP and a CORESET 310 (e.g., with IDs #2 and #3) for control information of a second TRP. In other examples, the number of CORESETs assigned to each TRP may be different. In this example, the lowest CORESET ID of each group of CORESETs 305, 310 may be used to determine the default beam.

[0109] As discussed with reference to FIG. 2 , in some cases, where a default beam cannot be received at a UE, a priority rule may be used to determine which TRP uses the initially determined default beam, where other TRP(s) may use a beam different from the initially determined default beam associated with the TRP. In other cases, the configured groups of CORESETs 305 and CORESETs 310 may be selected so that the corresponding beams are compatible and can be simultaneously received at the UE. In other cases, a first beam for a first TRP may be determined based on the lowest CORESET ID of the CORESET 305, and then a second beam for a second TRP may be determined based on a mapping to the first beam. In further cases, the serving base station 105 may explicitly configure the default beam for one or more TRPs in order to provide a compatible default beam for each TRP.

[0110] By supporting communication with multiple TRPs, the UE may be able to increase throughput and improve reliability of communication in a wireless communication system. For example, when operating in a multi-TRP operation mode, the UE may receive different downlink data from multiple TRPs simultaneously, thereby improving throughput, or the UE may receive the same downlink data from multiple TRPs, thereby improving reliability (e.g., the UE has a higher probability of receiving the data).

[0111] 4 illustrates an example of a wireless communication system 400 that supports a default transmission beam for multiple transmit-receive points in wireless communication according to aspects of the present disclosure. In some examples, the wireless communication system 400 may implement aspects of the wireless communication system 100 or 200. The wireless communication system 400 includes a base station 105-a, which may be an example of the base station 105 described with reference to FIGS. 1 and 2. The wireless communication system 400 also includes a UE 115-b, which may be an example of the UE 115 described with reference to FIGS. 1 and 2. The base station 105-a may provide communication coverage for a geographic coverage area 110-a, which may be an example of the coverage area 110 described with reference to FIG. 1. The wireless communication system 400 may implement aspects of the wireless communication system 100.

[0112] In the example of FIG. 4 , UE 115-b may be configured to communicate with at least a first TRP and a second TRP in a multi-TRP mode of operation. For example, UE 115-b may receive a control message (e.g., an RRC message) with a CORESET configuration 405 from base station 105-a indicating that UE 115-b is to communicate with a first TRP and a second TRP in a multi-TRP mode of operation. The control message may indicate a CORESET of UE 115-c to monitor control information from each TRP in the multi-TRP mode of operation. Thus, UE 115-b may monitor a first set of CORESETs for control information of a first TRP and a second set of CORESETs for control information of a second TRP.

[0113] In order to select a default beam for each TRP that is simultaneously transmitted to UE 115-b, UE 115-b in this example may send an incompatible beam report 410 to base station 105-a. Incompatible beam report 410 may provide, for example, a list of beams that may not be received simultaneously at UE 115-b. For example, each TRP may include three CORESETs, and UE 115-b may report a 3×3 matrix in which each entry indicates a “1” to indicate a corresponding CORESET from two TRPs that may be received simultaneously and a corresponding default beam from each TRP. In a further example, UE 115-b may report CORESET groups separately, which may include each row in a table corresponding to one CORESET group. Thus, a first row may include an indication of a first CORESET from a first TRP and a second CORESET from a second TRP, indicating that UE 115-b may receive two CORESETs simultaneously.

[0114] FIG. 5 illustrates an example of a processing flow 500 for supporting a default transmission beam for multiple transmit-receive points in wireless communication according to various aspects of the present disclosure. In some examples, the processing flow 500 may implement various aspects of the wireless communication system 100, 200, or 400. The processing flow 500 may include a UE 115-c and a base station 105-b, which may be respective examples of a UE and a base station described herein. In the following description of the processing flow 500, operations between the UE 115-c and the base station 105-b may be sent in an order different from the order shown or operations performed by the base station 105-b and the UE 115-c may be performed in a different order or at a different time. Some operations may also be excluded from the processing flow 500, or other operations may be added to the processing flow 500. It should be understood that although the base station 105-b and the UE 115-c are shown as performing multiple operations in the processing flow 500, any wireless device may perform the operations shown.

[0115] For example, the base station 105-b may control or configure the first TRP 505-a and the second TRP 505-b, and the TRP 505-a and the TRP 505-b may perform some operations on behalf of the base station 105-b. In some cases, the base station 105-b may refer to the TRP 505-a and the TRP 505-b. As discussed herein, the base station 105-b may identify that the offset between the PDCCH and the PDSCH is below a threshold (e.g., the offset between the received PDCCH and the corresponding PDSCH is below a threshold). The base station 105-b can then identify a first beam of a first TRP (e.g., TRP 505-a) and a second beam of a second TRP (e.g., TRP 505-b) based on identifying that the offset is below a threshold, and can schedule simultaneous transmissions (e.g., in parallel during a symbol) from TRP 505-a and TRP 505-b (e.g., where TRP 505-a is scheduled based on the identified first beam, and TRP 505-b is scheduled based on the identified second beam).

[0116] Optionally, at 510, the UE 115-c may generate an incompatible beam report (which may also be referred to as a panel ID report) and may send the report to the base station 105-b (e.g., via the first TRP 505-a) at 515. The incompatible beam report may indicate beams of different CORESETs of different TRPs 505 that may and may not be simultaneously received at the UE 115-c (e.g., based on whether the associated beams of the different CORESETs at the UE 115-c use the same antenna panel or different antenna panels).

[0117] At 520, the base station 105-b may determine a default beam configuration, which may be sent to the UE 115-c at 515 (e.g., via the first TRP 505-a). In some cases, the default beam information may be sent in RRC signaling, MAC-CE, or DCI. In some cases, the first default beam and the second default beam (e.g., scheduled by TRP 505-a and TRP 505-b, respectively) may be associated with a CORESET of a subset of one or more CORESETs (e.g., where CORESET corresponds to the lowest CORESET ID). The default beam information may be identified according to techniques such as those described herein.

[0118] At 530, UE 115-c can determine that the offset between the PDCCH and the PDSCH is below a threshold (e.g., UE 115-c can receive the PDCCH and identify that a corresponding PDSCH is to be received based on a timing offset from the PDCCH that is below a threshold associated with switching UE 115-c components between beams). Similarly, at 535, base station 105-b can determine that the offset between the PDCCH and the PDSCH is below a threshold.

[0119] At 540, UE 115-c may determine a default beam based on identifying that the offset is below a threshold and the default beam information. For example, UE 115-c may determine a first default beam for a first TRP 505-a and a second default beam for a second TRP 505-b. The default beam may be identified based on techniques such as those described herein. Similarly, at 545, the base station may determine a default beam based on identifying that the offset is below a threshold and the default beam information, and may schedule transmissions at the first TRP 505-a using the first default beam and schedule transmissions at the second TRP 505-b using the second default beam.

[0120] At 550, using the first set of beamforming parameters for the first default beam, the first TRP 505-a can transmit the first beam and the UE 115-c can receive the first beam. In addition, using the second set of beamforming parameters for the second default beam, the second TRP 505-b can transmit the second beam and the UE 115-c can receive the second beam. As discussed herein, in some cases, the UE 115-c can monitor the time slot based on the identified configuration, the first set of beamforming parameters for the first default beam and the second set of beamforming parameters for the second default beam (e.g., the beamforming parameters for the default receive beam(s) can be derived from the QCL of the CORESET associated with the default beam).

[0121] At 555, UE 115-c may buffer a first set of downlink transmissions received from TRP 505-a on a first beam and a second set of downlink transmissions received from TRP 505-b on a second beam.

[0122] At 525, UE 115-c may decode the buffered first set of downlink transmissions and the buffered second set of downlink transmissions.

[0123] 6 shows a block diagram 600 of a device 605 that supports a default transmission beam for multiple transmit-receive points in wireless communication according to aspects of the present disclosure. The device 605 can be an example of aspects of the UE 115 as described herein. The device 605 can include a receiver 610, a communication manager 615, and a transmitter 620. The device 605 can also include a processor. Each of these components can communicate with each other (e.g., via one or more buses).

[0124] The receiver 610 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to default transmission beams for multiple transmit-receive points in wireless communications, etc.). The information may be passed to other components of the device 605. The receiver 610 may be an example of aspects of the transceiver 920 described with reference to FIG. 9. The receiver 610 may use a single antenna or a collection of antennas.

[0125] The communication manager 615 can identify a first default beam for receiving downlink transmissions from a first transmit-receive point and a second default beam for receiving downlink transmissions from a second transmit-receive point, determine that the first default beam and the second default beam cannot be received simultaneously at the UE, select one of the first default beam and the second default beam in response to the determination and at least in part based on a predetermined priority rule, and receive downlink communications from the transmit-receive point associated with the selected default beam.

[0126] The communication manager 615 may also identify a mapping between one or more control resource sets and one or more default beams for each of a first transmit-receive point and a second transmit-receive point, wherein the mapping indicates one or more default beams of the second transmit-receive point that allow simultaneous reception of downlink communications from two or more transmit-receive points, determine a first default beam for the first transmit-receive point, select a second default beam for the second transmit-receive point based on the mapping, and receive simultaneous downlink communications from the first transmit-receive point using the first default beam and from the second transmit-receive point using the second default beam.

[0127] The communication manager 615 may also receive configuration information from a base station indicating a first default beam for receiving downlink transmissions from a first transmission-reception point and a second default beam for receiving downlink transmissions from a second transmission-reception point, wherein one or more of the first default beam or the second default beam is independent of an associated control transmission beam for transmitting control information to a UE, identify that a time offset between a physical downlink control channel transmission and a physical downlink shared channel transmission of each of the first transmission-reception point and the second transmission-reception point is below a threshold, and based on identifying that the time offset is below the threshold, receive the first default beam from the first transmission-reception point and simultaneously receive the second default beam from the second transmission-reception point. The communication manager 615 may be an example of aspects of the communication manager 910 described herein.

[0128] The communication manager 615 or its subcomponents may be implemented in hardware, in code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 615 or its subcomponents may be performed by a general purpose processor, a DSP, an application specific integrated circuit (ASIC), an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

[0129] The communication manager 615 or its subcomponents can be physically located in a variety of locations, including being distributed so that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, the communication manager 615 or its subcomponents can be separate and distinct components according to aspects of the present disclosure. In some examples, according to aspects of the present disclosure, the communication manager 615 or its subcomponents can be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, another computing device, one or more other components described in the present disclosure, or a combination thereof.

[0130] The transmitter 620 can transmit signals generated by other components of the device 605. In some examples, the transmitter 620 can be collocated with the receiver 610 in a transceiver module. For example, the transmitter 620 can be an example of aspects of the transceiver 920 described with reference to FIG. 9. The transmitter 620 can use a single antenna or a collection of antennas.

[0131] 7 shows a block diagram 700 of a device 705 that supports a default transmission beam for multiple transmit-receive points in wireless communication according to aspects of the present disclosure. The device 705 can be an example of aspects of the device 605 or UE 115 as described herein. The device 705 can include a receiver 710, a communication manager 715, and a transmitter 745. The device 705 can also include a processor. Each of these components can communicate with each other (e.g., via one or more buses).

[0132] The receiver 710 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to default transmission beams for multiple transmit-receive points in wireless communications, etc.). The information may be passed to other components of the device 705. The receiver 710 may be an example of aspects of the transceiver 920 described with reference to FIG. 9. The receiver 710 may use a single antenna or a collection of antennas.

[0133] The communication manager 715 may be an example of aspects of the communication manager 615 as described herein. The communication manager 715 may include a beam management component 720, a beam configuration component 725, a default beam manager 730, a buffer component 735, and a beam mapping manager 740. The communication manager 715 may be an example of aspects of the communication manager 910 described herein.

[0134] In some cases, the beam management component 720 can identify a first default beam for receiving downlink transmissions from a first transmit-receive point and a second default beam for receiving downlink transmissions from a second transmit-receive point. The beam configuration component 725 can determine that the first default beam and the second default beam cannot be received simultaneously at the UE. The default beam manager 730 can select one of the first default beam and the second default beam in response to the determination and based at least in part on a predetermined priority rule. The buffer component 735 can receive downlink communications from the transmit-receive point associated with the selected default beam.

[0135] In some cases, the beam mapping manager 740 may identify a mapping between one or more control resource sets and one or more default beams for each of a first transmit-receive point and a second transmit-receive point, wherein the mapping indicates one or more default beams for the second transmit-receive point that allow simultaneous reception of downlink communications from two or more transmit-receive points. The default beam manager 730 may determine a first default beam for the first transmit-receive point and select a second default beam for the second transmit-receive point based on the mapping. The buffer component 735 may receive simultaneous downlink communications from the first transmit-receive point using the first default beam and from the second transmit-receive point using the second default beam.

[0136] In some cases, the beam configuration component 725 can receive configuration information from a base station indicating a first default beam for receiving downlink transmissions from a first transmit-receive point and a second default beam for receiving downlink transmissions from a second transmit-receive point, wherein one or more of the first default beam or the second default beam is independent of an associated control transmission beam for transmitting control information to the UE. The default beam manager 730 can identify that a time offset between a physical downlink control channel transmission and a physical downlink shared channel transmission for each of the first transmit-receive point and the second transmit-receive point is below a threshold. Based on identifying that the time offset is below the threshold, the buffer component 735 can simultaneously receive the first default beam from the first transmit-receive point and the second default beam from the second transmit-receive point.

[0137] The transmitter 745 can transmit signals generated by other components of the device 705. In some examples, the transmitter 745 can be collocated with the receiver 710 in a transceiver module. For example, the transmitter 745 can be an example of aspects of the transceiver 920 described with reference to FIG. 9. The transmitter 745 can use a single antenna or a group of antennas.

[0138] 8 shows a block diagram 800 of a communication manager 805 that supports default transmission beams for multiple transmit-receive points in wireless communications according to aspects of the present disclosure. The communication manager 805 can be an example of aspects of the communication manager 615, the communication manager 715, or the communication manager 910 described herein. The communication manager 805 can include a beam management component 810, a beam configuration component 815, a default beam manager 820, a buffer component 825, an incompatible beam report manager 830, a beam mapping manager 835, and a CORESET manager 840. Each of these modules can communicate with each other directly or indirectly (e.g., via one or more buses).

[0139] The beam management component 810 can identify a first default beam for receiving downlink transmissions from a first transmit-receive point and a second default beam for receiving downlink transmissions from a second transmit-receive point.

[0140] The beam configuration component 815 can determine that the first default beam and the second default beam cannot be received simultaneously at the UE. In some examples, the beam configuration component 815 can receive configuration information from a base station, indicating a first default beam for receiving downlink transmissions from a first transmit-receive point and a second default beam for receiving downlink transmissions from a second transmit-receive point, wherein one or more of the first default beam or the second default beam is independent of an associated control transmission beam for transmitting control information to the UE. In some cases, the configuration information from the base station is received in a media access control (MAC) control element (CE). In some cases, the same MAC-CE indicates the first default beam and the second default beam. In some cases, the first default beam is determined based on an associated control transmission beam of the first transmit-receive point, and the second default beam is explicitly indicated in the configuration information.

[0141] The default beam manager 820 may select one of the first default beam and the second default beam in response to the determination and based at least in part on a predetermined priority rule.

[0142] In some examples, the default beam manager 820 can determine a first default beam for the first transmit-receive point. In some examples, the default beam manager 820 can select a second default beam for the second transmit-receive point based on the mapping.

[0143] In some examples, the default beam manager 820 can identify that the time offset between the physical downlink control channel transmission and the physical downlink shared channel transmission of each of the first transmit-receive point and the second transmit-receive point is below a threshold.

[0144] In some examples, the default beam manager 820 can determine that a first transmit-receive point is associated with a first control resource set group and a second transmit-receive point is associated with a second control resource set group, wherein the first control resource set group is associated with a first default beam and the second control resource set group is associated with a second default beam, wherein a predetermined priority rule indicates which of the first control resource set group or the second control resource set group has a higher priority.

[0145] In some examples, the default beam manager 820 may receive an indication from the base station indicating which of the first control resource set group or the second control resource set group has a higher priority. In some examples, the default beam manager 820 may determine one or more parameters of each of the first control resource set group and the second control resource set group, wherein the predetermined priority rule is based on the determined one or more parameters. In some cases, the predetermined priority rule indicates a pre-specified priority of the first control resource set group and the second control resource set group. In some cases, the indication from the base station is provided in an RRC transmission, a MAC-CE, a DCI, or any combination thereof. In some cases, the one or more parameters include one or more of the number of control resource sets in each of the first control resource set group and the second control resource set group, the search space monitoring period of each of the first control resource set and the second control resource set group, or any combination thereof.

[0146] In some cases, the predetermined priority rule indicates that the transmit-receive point associated with the switching operation has a higher priority than other transmit-receive points.

[0147] In some cases, the predetermined priority rule provides that the priorities of different transmit-receive points can change based on one or more parameters. In some cases, the one or more parameters include transmission time slots, and wherein a first default beam of a first transmit-receive point is selected for a first subset of the transmission time slots, and a second default beam of a second transmit-receive point is selected for a second subset of the transmission time slots. In some cases, the one or more parameters include a value of a control resource set identifier associated with each of the first transmit-receive point and the second transmit-receive point, and wherein the lowest valued control resource set identifier has the highest priority and the associated default transmission beam is selected for communication with the associated transmit-receive point.

[0148] The buffer component 825 can receive downlink communications from the transmit-receive point associated with the selected default beam. In some examples, the buffer component 825 can simultaneously receive a first default beam from a first transmit-receive point and a second default beam from a second transmit-receive point based on identifying that the time offset is below a threshold.

[0149] The beam mapping manager 835 may identify a mapping between one or more control resource sets and one or more default beams for each of a first transmit-receive point and a second transmit-receive point, wherein the mapping indicates one or more default beams for the second transmit-receive point that allow simultaneous reception of downlink communications from two or more transmit-receive points. In some examples, any default beam associated with a first subset of control resource sets may be received at the UE simultaneously with any default beam associated with a second subset of control resource sets. In some cases, the mapping indicates a first subset of control resource sets for the first transmit-receive point and a second subset of control resource sets for the second transmit-receive point, each control resource set having an associated default beam and wherein the first subset of control resource sets and the second subset of control resource sets do not overlap. In some cases, the first default beam is determined based on the first subset of control resource sets, and the second default beam is determined based on the second subset of control resource sets.

[0150] The incompatible beam report manager 830 may send an incompatible beam report indicating beams that cannot be simultaneously received at the UE to the serving base station.

[0151] The CORESET manager 840 may determine one or more control resource sets associated with different transmit-receive points. In some cases, a first default beam for a first transmit-receive point is determined based on a control resource set received on a downlink control channel at the UE, and a second default beam is mapped to the first default beam. In some cases, the mapping specifies that the second default beam does not correspond to any configured control resource set of the first transmit-receive point.

[0152] 9 shows a diagram of a system 900 including a device 905 that supports a default transmission beam for multiple transmit-receive points in wireless communication according to various aspects of the present disclosure. The device 905 may be a component of or include components of the device 605, device 705, or UE 115 as described herein. The device 905 may include components for two-way voice and data communications, including components for sending and receiving communications, including a communication manager 910, an I / O controller 915, a transceiver 920, an antenna 925, a memory 930, and a processor 940. These components may communicate electronically via one or more buses (e.g., bus 945).

[0153] The communication manager 910 can identify a first default beam for receiving downlink transmissions from a first transmit-receive point and a second default beam for receiving downlink transmissions from a second transmit-receive point, determine that the first default beam and the second default beam cannot be received simultaneously at the UE, select one of the first default beam and the second default beam in response to the determination and at least in part based on a predetermined priority rule, and receive downlink communications from the transmit-receive point associated with the selected default beam.

[0154] The communication manager 910 may also identify a mapping between one or more control resource sets and one or more default beams for each of a first transmit-receive point and a second transmit-receive point, wherein the mapping indicates one or more default beams for the second transmit-receive point that allow simultaneous reception of downlink communications from two or more transmit-receive points, determine a first default beam for the first transmit-receive point, select a second default beam for the second transmit-receive point based on the mapping, and receive simultaneous downlink communications from the first transmit-receive point using the first default beam and from the second transmit-receive point using the second default beam.

[0155] The communication manager 910 may also receive configuration information from a base station indicating a first default beam for receiving downlink transmissions from a first transmit-receive point and a second default beam for receiving downlink transmissions from a second transmit-receive point, wherein one or more of the first default beam or the second default beam are independent of an associated control transmission beam for transmitting control information to the UE, identify that a time offset between a physical downlink control channel transmission and a physical downlink shared channel transmission of each of the first transmit-receive point and the second transmit-receive point is lower than a threshold, and based on identifying that the time offset is lower than the threshold, simultaneously receive the first default beam from the first transmit-receive point and the second default beam from the second transmit-receive point.

[0156] I / O controller 915 can manage input and output signals of device 905. I / O controller 915 can also manage peripheral devices that are not integrated into device 905. In some cases, I / O controller 915 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 915 can utilize an operating system such as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS / 2®, UNIX®, LINUX® or other known operating systems. In other cases, I / O controller 915 can represent or interact with a modem, keyboard, mouse, touch screen or similar device. In some cases, I / O controller 915 can be implemented as a part of a processor. In some cases, a user can interact with device 905 through I / O controller 915 or through a hardware component controlled by I / O controller 915.

[0157] The transceiver 920 can communicate bidirectionally via one or more antennas, wired or wireless links as described above. For example, the transceiver 920 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 920 can also include a modem to modulate packets and provide the modulated packets to an antenna for transmission, and demodulate packets received from an antenna.

[0158] In some cases, a wireless device may include a single antenna 925. However, in some cases, a device may have more than one antenna 925, which may be capable of sending or receiving multiple wireless transmissions simultaneously.

[0159] The memory 930 may include RAM and ROM. The memory 930 may store computer-readable computer executable code 935 including instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, the memory 930 may contain, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0160] The processor 940 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 940 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into the processor 940. The processor 940 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 930) to cause the device 905 to perform various functions (e.g., functions or tasks of supporting default transmission beams of multiple transmit-receive points in wireless communication).

[0161] The code 935 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 935 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 935 may not be directly executable by the processor 940, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0162] 10 shows a block diagram 1000 of a device 1005 that supports a default transmission beam for multiple transmit-receive points in wireless communication according to aspects of the present disclosure. The device 1005 can be an example of aspects of the base station 105 as described herein. The device 1005 can include a receiver 1010, a communication manager 1015, and a transmitter 1020. The device 1005 can also include a processor. Each of these components can communicate with each other (e.g., via one or more buses).

[0163] The receiver 1010 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to default transmission beams of multiple transmit-receive points in wireless communication, etc.). The information may be passed to other components of the device 1005. The receiver 1010 may be an example of aspects of the transceiver 1320 described with reference to FIG. 13. The receiver 1010 may use a single antenna or a set of antennas.

[0164] The communication manager 1015 can identify a first default beam for sending a first downlink communication from a first transmit-receive point to a UE and a second default beam for sending a second downlink communication from a second transmit-receive point to the UE, determine that the first default beam and the second default beam cannot be received simultaneously at the UE, and in response to the determination and based on a predetermined priority rule, schedule the first transmit-receive point to send the first downlink communication using the first default beam, and schedule the second transmit-receive point to send the second downlink communication using a second beam different from the second default beam, wherein the scheduling is used to receive both the first downlink communication and the second downlink communication simultaneously at the UE.

[0165] The communication manager 1015 may also identify a mapping between one or more control resource sets and one or more default beams for each of a first transmit-receive point and a second transmit-receive point, wherein the mapping indicates one or more default beams for the second transmit-receive point that allow downlink communications from two or more transmit-receive points to be received simultaneously at the UE, determine a first default beam for the first transmit-receive point, select a second default beam for the second transmit-receive point based on the mapping, and in response to the determination and selection, schedule the first transmit-receive point to send a first downlink communication using the first default beam, and schedule the second transmit-receive point to send a second downlink communication using a second beam different from the second default beam, wherein the scheduling is used to receive both the first downlink communication and the second downlink communication simultaneously at the UE.

[0166] The communication manager 1015 may also send configuration information to the UE indicating a first default beam for receiving downlink communications from a first transmit-receive point and a second default beam for receiving downlink communications from a second transmit-receive point, wherein one or more of the first default beam or the second default beam is independent of an associated control transmission beam for transmitting control information to the UE, identifying that a time offset between a physical downlink control channel communication and a physical downlink shared channel communication of each of the first transmit-receive point and the second transmit-receive point is below a threshold, and in response to the identification, scheduling the first transmit-receive point to transmit the first downlink communication using the first default beam, scheduling the second transmit-receive point to transmit the second downlink communication using the second default beam, wherein the scheduling is for receiving both the first downlink communication and the second downlink communication at the UE simultaneously. The communication manager 1015 may be an example of aspects of the communication manager 1310 described herein.

[0167] The communication manager 1015 or its subcomponents may be implemented in hardware, code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 1015 or its subcomponents may be performed by a general purpose processor, a DSP, an application specific integrated circuit (ASIC), an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

[0168] The communication manager 1015 or its subcomponents can be physically located in various locations, including being distributed so that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, the communication manager 1015 or its subcomponents can be separate and distinct components according to aspects of the present disclosure. In some examples, according to aspects of the present disclosure, the communication manager 1015 or its subcomponents can be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, another computing device, one or more other components described in the present disclosure, or a combination thereof.

[0169] The transmitter 1020 can transmit signals generated by other components of the device 1005. In some examples, the transmitter 1020 can be collocated with the receiver 1010 in a transceiver module. For example, the transmitter 1020 can be an example of aspects of the transceiver 1320 described with reference to FIG. The transmitter 1020 can use a single antenna or a collection of antennas.

[0170] 11 shows a block diagram 1100 of a device 1105 that supports a default transmission beam for multiple transmit-receive points in wireless communication according to aspects of the present disclosure. The device 1105 can be an example of aspects of the device 1005 or base station 105 as described herein. The device 1105 may include a receiver 1110, a communication manager 1115, and a transmitter 1140. The device 1105 may also include a processor. Each of these components can communicate with each other (e.g., via one or more buses).

[0171] The receiver 1110 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to default transmission beams of multiple transmit-receive points in wireless communication, etc.). The information may be passed to other components of the device 1105. The receiver 1110 may be an example of aspects of the transceiver 1320 described with reference to FIG. 13. The receiver 1110 may use a single antenna or a group of antennas.

[0172] The communication manager 1115 may be an example of aspects of the communication manager 1015 as described herein. The communication manager 1115 may include a beam configuration component 1120, a default beam manager 1125, a beam management component 1130, and a beam mapping manager 1135. The communication manager 1115 may be an example of aspects of the communication manager 1310 described herein.

[0173] In some cases, the beam configuration component 1120 may identify a first default beam for transmitting a first downlink communication from a first transmit-receive point to a UE and a second default beam for transmitting a second downlink communication from a second transmit-receive point to the UE. The default beam manager 1125 may determine that the first default beam and the second default beam cannot be received simultaneously at the UE. The beam management component 1130 may, in response to the determination and based on a predetermined priority rule, schedule the first transmit-receive point to transmit the first downlink communication using the first default beam, and schedule the second transmit-receive point to transmit the second downlink communication using a second beam different from the second default beam, wherein the scheduling is for receiving both the first downlink communication and the second downlink communication simultaneously at the UE.

[0174] In some cases, the beam mapping manager 1135 may identify a mapping between one or more control resource sets and one or more default beams for each of the first transmit-receive point and the second transmit-receive point, wherein the mapping indicates one or more default beams for the second transmit-receive point that allow downlink communications from two or more transmit-receive points to be received simultaneously at the UE. The default beam manager 1125 may determine a first default beam for the first transmit-receive point and select a second default beam for the second transmit-receive point based on the mapping. The beam management component 1130 may, in response to the determination and selection, schedule the first transmit-receive point to send a first downlink communication using the first default beam, and schedule the second transmit-receive point to send a second downlink communication using a second beam different from the second default beam, wherein the scheduling is for receiving both the first downlink communication and the second downlink communication simultaneously at the UE.

[0175] In some cases, the beam configuration component 1120 may send configuration information to the UE indicating a first default beam for receiving downlink communications from a first transmit-receive point and a second default beam for receiving downlink communications from a second transmit-receive point, wherein one or more of the first default beam or the second default beam is independent of an associated control transmission beam for transmitting control information to the UE. The default beam manager 1125 may identify that a time offset between a physical downlink control channel communication and a physical downlink shared channel communication of each of the first transmit-receive point and the second transmit-receive point is below a threshold. The beam management component 1130 may, in response to the identification, schedule the first transmit-receive point to send a first downlink communication using the first default beam and schedule the second transmit-receive point to send a second downlink communication using the second default beam, wherein the scheduling is for simultaneously receiving both the first downlink communication and the second downlink communication at the UE.

[0176] The transmitter 1140 can transmit signals generated by other components of the device 1105. In some examples, the transmitter 1140 can be collocated with the receiver 1110 in a transceiver module. For example, the transmitter 1140 can be an example of aspects of the transceiver 1320 described with reference to FIG. The transmitter 1140 can use a single antenna or a group of antennas.

[0177] 12 shows a block diagram 1200 of a communication manager 1205 that supports default transmission beams for multiple transmit-receive points in wireless communications according to aspects of the present disclosure. The communication manager 1205 can be an example of aspects of the communication manager 1015, the communication manager 1115, or the communication manager 1310 described herein. The communication manager 1205 can include a beam configuration component 1210, a default beam manager 1215, a beam management component 1220, a beam mapping manager 1225, and a CORESET manager 1230. Each of these modules can communicate with each other directly or indirectly (e.g., via one or more buses).

[0178] The beam configuration component 1210 can identify a first default beam for transmitting a first downlink communication from a first transmission-reception point to a UE and a second default beam for transmitting a second downlink communication from a second transmission-reception point to the UE.

[0179] In some examples, the beam configuration component 1210 can send configuration information to the UE, indicating a first default beam for receiving downlink communications from a first transmit-receive point and a second default beam for receiving downlink communications from a second transmit-receive point, wherein one or more of the first default beam or the second default beam is independent of an associated control transmission beam that transmits control information to the UE. In some cases, the configuration information from the base station is transmitted in a MAC-CE. In some cases, the same MAC-CE indicates the first default beam and the second default beam. In some cases, the first default beam is determined based on the associated control transmission beam of the first transmit-receive point, and the second default beam is explicitly indicated in the configuration information.

[0180] The default beam manager 1215 may determine that the first default beam and the second default beam cannot be simultaneously received at the UE. In some examples, the default beam manager 1215 may determine the first default beam for the first transmit-receive point. In some examples, the default beam manager 1215 may select the second default beam for the second transmit-receive point based on the mapping. In some examples, the default beam manager 1215 may identify that the time offset between the physical downlink control channel communication and the physical downlink shared channel communication of each of the first transmit-receive point and the second transmit-receive point is below a threshold.

[0181] In some examples, the default beam manager 1215 may determine that the first transmit-receive point is associated with the first control resource set group and the second transmit-receive point is associated with the second control resource set group, wherein the first control resource set group is associated with the first default beam and the second control resource set group is associated with the second default beam, wherein the predetermined priority rule indicates which of the first control resource set group or the second control resource set group has a higher priority. In some examples, the default beam manager 1215 may send an indication to the UE indicating which of the first control resource set group or the second control resource set group has a higher priority. In some examples, the default beam manager 1215 may determine one or more parameters of each of the first control resource set group and the second control resource set group, wherein the predetermined priority rule is based on the determined one or more parameters. In some cases, the predetermined priority rule indicates a pre-specified priority of the first control resource set group and the second control resource set group. In some cases, the one or more parameters include one or more of the number of control resource sets in each of the first control resource set group and the second control resource set group, the search space monitoring period of each of the first control resource set and the second control resource set group, or any combination thereof.

[0182] In some cases, the predetermined priority rule provides that the priorities of different transmit-receive points can change based on one or more parameters. In some cases, the one or more parameters include transmission time slots, and wherein a first default beam of a first transmit-receive point is selected for a first subset of the transmission time slots, and a second default beam of a second transmit-receive point is selected for a second subset of the transmission time slots. In some cases, the one or more parameters include a value of a control resource set identifier associated with each of the first transmit-receive point and the second transmit-receive point, and wherein the lowest valued control resource set identifier has the highest priority and the associated default transmission beam is selected for communication with the associated transmit-receive point.

[0183] The beam management component 1220 can schedule a first transmit-receive point to send a first downlink communication using a first default beam and schedule a second transmit-receive point to send a second downlink communication using a second beam different from the second default beam in response to determining and based on a predetermined priority rule, wherein the scheduling is used to simultaneously receive both the first downlink communication and the second downlink communication at the UE.

[0184] In some examples, beam management component 1220 can, in response to determining and selecting, schedule a first transmit-receive point to send a first downlink communication using a first default beam and schedule a second transmit-receive point to send a second downlink communication using a second beam different from the second default beam, wherein the scheduling is used to simultaneously receive both the first downlink communication and the second downlink communication at the UE.

[0185] In some examples, beam management component 1220 can, in response to identification, schedule a first transmit-receive point to send a first downlink communication using a first default beam and schedule a second transmit-receive point to send a second downlink communication using a second default beam, wherein the scheduling is used to simultaneously receive both the first downlink communication and the second downlink communication at the UE.

[0186] The beam mapping manager 1225 may identify a mapping between one or more control resource sets and one or more default beams for each of a first transmit-receive point and a second transmit-receive point, wherein the mapping indicates one or more default beams for the second transmit-receive point that allow downlink communications from two or more transmit-receive points to be received simultaneously at the UE. In some examples, any default beam associated with a first subset of control resource sets may be received at the UE simultaneously with any default beam associated with a second subset of control resource sets. In some cases, the mapping indicates a first subset of control resource sets for the first transmit-receive point and a second subset of control resource sets for the second transmit-receive point, each control resource set having an associated default beam and wherein the first subset of control resource sets and the second subset of control resource sets do not overlap. In some cases, the first default beam is determined based on the first subset of control resource sets, and the second default beam is determined based on the second subset of control resource sets.

[0187] The CORESET manager 1230 may identify a control resource set for the TRP. In some cases, a first default beam for a first transmit-receive point is determined based on a control resource set received on a downlink control channel at the UE, and a second default beam is mapped to the first default beam. In some cases, the mapping specifies that the second default beam does not correspond to any configured control resource set for the first transmit-receive point.

[0188] 13 shows a diagram of a system 1300 including a device 1305 that supports a default transmission beam for multiple transmit-receive points in wireless communication according to various aspects of the present disclosure. The device 1305 may be an example of or include components of the device 1005, device 1105, or base station 105 as described herein. The device 1305 may include components for two-way voice and data communications, including components for sending and receiving communications, including a communication manager 1310, a network communication manager 1315, a transceiver 1320, an antenna 1325, a memory 1330, a processor 1340, and an inter-station communication manager 1345. These components may communicate electronically via one or more buses (e.g., bus 1350).

[0189] The communication manager 1310 can identify a first default beam for sending a first downlink communication from a first transmit-receive point to a UE and a second default beam for sending a second downlink communication from a second transmit-receive point to the UE, determine that the first default beam and the second default beam cannot be received simultaneously at the UE, and in response to the determination and based on a predetermined priority rule, schedule the first transmit-receive point to send the first downlink communication using the first default beam, and schedule the second transmit-receive point to send the second downlink communication using a second beam different from the second default beam, wherein the scheduling is used to receive both the first downlink communication and the second downlink communication simultaneously at the UE.

[0190] The communication manager 1310 may also identify a mapping between one or more control resource sets and one or more default beams for each of the first transmission-reception point and the second transmission-reception point, wherein the mapping indicates one or more default beams for the second transmission-reception point that allow downlink communications from two or more transmission-reception points to be received simultaneously at the UE. A first default beam for the first transmission-reception point is determined and a second default beam for the second transmission-reception point is selected based on the mapping. In response to the determination and the selection, the first transmission-reception point is scheduled to send a first downlink communication using the first default beam, and the second transmission-reception point is scheduled to send a second downlink communication using a second beam different from the second default beam, wherein the scheduling is for receiving both the first downlink communication and the second downlink communication simultaneously at the UE.

[0191] The communication manager 1310 may also send configuration information to the UE, indicating a first default beam for receiving downlink communications from a first transmit-receive point and a second default beam for receiving downlink communications from a second transmit-receive point, wherein one or more of the first default beam or the second default beam are independent of an associated control transmission beam for transmitting control information to the UE, identifying that a time offset between physical downlink control channel communications and physical downlink shared channel communications of each of the first transmit-receive point and the second transmit-receive point is below a threshold, and in response to the identification, scheduling the first transmit-receive point to send a first downlink communication using the first default beam, and scheduling the second transmit-receive point to send a second downlink communication using the second default beam, wherein the scheduling is used to simultaneously receive both the first downlink communication and the second downlink communication at the UE.

[0192] The network communications manager 1315 may manage communications with the core network (eg, via one or more wired backhaul links). For example, the network communications manager 1315 may manage the delivery of data communications for client devices such as one or more UEs 115.

[0193] The transceiver 1320 can communicate bidirectionally through one or more antennas, wired or wireless links, as described above. For example, the transceiver 1320 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 1320 can also include a modem to modulate packets and provide the modulated packets to the antenna for transmission, and demodulate packets received from the antenna.

[0194] In some cases, a wireless device may include a single antenna 1325. However, in some cases, a device may have more than one antenna 1325, which may be capable of sending or receiving multiple wireless transmissions simultaneously.

[0195] Memory 1330 may include RAM, ROM, or a combination thereof. Memory 1330 may store computer readable code 1335 including instructions that, when executed by a processor (e.g., processor 1340), cause the device to perform various functions described herein. In some cases, memory 1330 may contain, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0196] Processor 1340 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, processor 1340 may be configured to operate a memory array using a memory controller. In some cases, the memory controller may be integrated into processor 1340. Processor 1340 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1330) to cause device 1305 to perform various functions (e.g., functions or tasks of supporting a default transmission beam for multiple transmit-receive points in wireless communication).

[0197] The inter-site communication manager 1345 may manage communications with other base stations 105 and may include a controller or scheduler for controlling communications with UE 115 in coordination with other base stations 105. For example, the inter-site communication manager 1345 may coordinate scheduling of transmissions to UE 115 for various interference mitigation techniques, such as beamforming or joint transmission. In some examples, the inter-site communication manager 1345 may provide an X2 interface within an LTE / LTE-A wireless communication network technology to provide communications between base stations 105.

[0198] The code 1335 may include instructions to implement various aspects of the present disclosure, including instructions to support wireless communications. The code 1335 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 1335 may not be directly executable by the processor 1340, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0199] FIG. 14 shows a flow chart illustrating a method 1400 for supporting a default transmission beam for multiple transmit-receive points in wireless communication according to various aspects of the present disclosure. The operations of the method 1400 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1400 may be performed by a communication manager as described with reference to FIG. 6 to FIG. 9. In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described below.

[0200] At 1405, the UE may identify a first default beam for receiving downlink transmissions from a first transmission-reception point and a second default beam for receiving downlink transmissions from a second transmission-reception point. The operations of 1405 may be performed according to the methods described herein. In some examples, aspects of the operations of 1405 may be performed by a beam management component as described with reference to FIGS. 6 to 9.

[0201] At 1410, the UE may determine that the first default beam and the second default beam cannot be received simultaneously at the UE. The operations of 1410 may be performed according to the methods described herein. In some examples, aspects of the operations of 1410 may be performed by a beam configuration component as described with reference to FIGS. 6 to 9.

[0202] Optionally, at 1415, the UE may determine that the first transmission-reception point is associated with a first control resource set group, and the second transmission-reception point is associated with a second control resource set group, wherein the first control resource set group is associated with a first default beam, and the second control resource set group is associated with a second default beam. The operations of 1415 may be performed according to the methods described herein. In some examples, aspects of the operations of 1415 may be performed by the default beam manager described with reference to FIGS. 6 to 9.

[0203] At 1420, the UE may select one of the first default beam and the second default beam in response to determining and based at least in part on a predetermined priority rule. The operations of 1420 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1420 may be performed by a default beam manager as described with reference to FIGS. 6 to 9. In some cases, the predetermined priority rule indicates which of the first control resource set group or the second control resource set group has a higher priority.

[0204] At 1425, the UE may receive downlink communications from the transmit-receive point associated with the selected default beam. The operations of 1425 may be performed according to the methods described herein. In some examples, aspects of the operations of 1425 may be performed by the buffer component described with reference to FIGS. 6 to 9.

[0205] FIG. 15 shows a flow chart illustrating a method 1500 for supporting a default transmission beam for multiple transmit-receive points in wireless communication according to various aspects of the present disclosure. The operations of the method 1500 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1500 may be performed by a communication manager as described with reference to FIG. 6 to FIG. 9. In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described below.

[0206] At 1505, the UE may receive an indication from the base station indicating which of the first control resource set group or the second control resource set group has a higher priority. The operations of 1505 may be performed according to the methods described herein. In some examples, aspects of the operations of 1505 may be performed by a default beam manager as described with reference to FIG6 to FIG9. In some cases, the indication from the base station is provided in an RRC transmission, a MAC-CE, a DCI, or any combination thereof.

[0207] At 1510, the UE may identify a first default beam for receiving downlink transmissions from a first transmit-receive point and a second default beam for receiving downlink transmissions from a second transmit-receive point. The operations of 1510 may be performed according to the methods described herein. In some examples, aspects of the operations of 1510 may be performed by a beam management component as described with reference to FIGS. 6 to 9.

[0208] At 1515, the UE may determine that the first default beam and the second default beam cannot be received simultaneously at the UE. The operations of 1515 may be performed according to the methods described herein. In some examples, aspects of the operations of 1515 may be performed by a beam configuration component as described with reference to FIGS. 6 to 9.

[0209] At 1520, the UE may determine that the first transmit-receive point is associated with a first control resource set group and the second transmit-receive point is associated with a second control resource set group, wherein the first control resource set group is associated with a first default beam and the second control resource set group is associated with a second default beam, wherein a predetermined priority rule indicates which of the first control resource set group or the second control resource set group has a higher priority. The operations of 1520 may be performed according to the methods described herein. In some examples, aspects of the operations of 1520 may be performed by a default beam manager as described with reference to FIGS. 6 to 9.

[0210] At 1525, the UE may select one of the first default beam and the second default beam in response to the determination and based at least in part on the predetermined priority rule. The operations of 1525 may be performed according to the methods described herein. In some examples, aspects of the operations of 1525 may be performed by the default beam manager described with reference to FIGS. 6 to 9.

[0211] At 1530, the UE may receive downlink communications from the transmit-receive point associated with the selected default beam. The operations of 1530 may be performed according to the methods described herein. In some examples, aspects of the operations of 1530 may be performed by a buffer component as described with reference to FIGS. 6 to 9.

[0212] FIG. 16 shows a flow chart illustrating a method 1600 for supporting a default transmission beam for multiple transmit-receive points in wireless communication according to various aspects of the present disclosure. The operations of the method 1600 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1600 may be performed by a communication manager as described with reference to FIG. 6 to FIG. 9. In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described below.

[0213] At 1605, the UE may identify a mapping between one or more control resource sets and one or more default beams for each of a first transmission-reception point and a second transmission-reception point, wherein the mapping indicates one or more default beams for the second transmission-reception point that allow simultaneous reception of downlink communications from two or more transmission-reception points. The operations of 1605 may be performed according to the methods described herein. In some examples, aspects of the operations of 1605 may be performed by a beam mapping manager as described with reference to FIGS. 6 to 9.

[0214] At 1610, the UE may determine a first default beam for a first transmit-receive point. The operations of 1610 may be performed according to the methods described herein. In some examples, aspects of the operations of 1610 may be performed by a default beam manager as described with reference to FIGS. 6 to 9.

[0215] At 1615, the UE may select a second default beam for the second transmit-receive point based on the mapping. The operations of 1615 may be performed according to the methods described herein. In some examples, aspects of the operations of 1615 may be performed by a default beam manager as described with reference to FIGS. 6 to 9.

[0216] At 1620, the UE may receive simultaneous downlink communications from the first transmit-receive point using the first default beam and from the second transmit-receive point using the second default beam. The operations of 1620 may be performed according to the methods described herein. In some examples, aspects of the operations of 1620 may be performed by a buffer component as described with reference to FIGS. 6 to 9.

[0217] FIG. 17 shows a flow chart illustrating a method 1700 for supporting a default transmission beam for multiple transmit-receive points in wireless communication according to various aspects of the present disclosure. The operations of the method 1700 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1700 may be performed by a communication manager as described with reference to FIGS. 6 to 9. In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described below.

[0218] At 1705, the UE may receive configuration information from a base station indicating a first default beam for receiving downlink transmissions from a first transmit-receive point and a second default beam for receiving downlink transmissions from a second transmit-receive point, wherein one or more of the first default beam or the second default beam is independent of an associated control transmission beam for transmitting control information to the UE. The operations of 1705 may be performed according to the methods described herein. In some examples, aspects of the operations of 1705 may be performed by a beam configuration component as described with reference to FIGS. 6 to 9.

[0219] At 1710, the UE may identify that a time offset between a physical downlink control channel transmission and a physical downlink shared channel transmission of each of the first transmission-reception point and the second transmission-reception point is below a threshold. The operations of 1710 may be performed according to the methods described herein. In some examples, aspects of the operations of 1710 may be performed by a default beam manager as described with reference to FIGS. 6 to 9.

[0220] At 1715, the UE may simultaneously receive a first default beam from a first transmit-receive point and a second default beam from a second transmit-receive point based on identifying that the time offset is below a threshold. The operations of 1715 may be performed according to the methods described herein. In some examples, aspects of the operations of 1715 may be performed by a buffer component as described with reference to FIGS. 6 to 9.

[0221] FIG. 18 shows a flow chart illustrating a method 1800 for supporting a default transmission beam for multiple transmit-receive points in wireless communication according to various aspects of the present disclosure. The operations of the method 1800 may be implemented by a base station 105 or a component thereof as described herein. For example, the operations of the method 1800 may be performed by a communication manager as described with reference to FIGS. 10 to 13. In some examples, the base station may execute a set of instructions to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described below.

[0222] At 1805, the base station may identify a first default beam for transmitting a first downlink communication from a first transmission-reception point to a UE and a second default beam for transmitting a second downlink communication from a second transmission-reception point to the UE. The operations of 1805 may be performed according to the methods described herein. In some examples, aspects of the operations of 1805 may be performed by a beam configuration component as described with reference to FIGS. 10 to 13.

[0223] At 1810, the base station may determine that the first default beam and the second default beam cannot be simultaneously received at the UE. The operation of 1810 may be performed according to the method described herein. In some examples, aspects of the operation of 1810 may be performed by the default beam manager described with reference to FIGS. 10 to 13.

[0224] At 1815, the base station may, in response to the determination and based on a predetermined priority rule, schedule the first transmit-receive point to send a first downlink communication using a first default beam, and schedule the second transmit-receive point to send a second downlink communication using a second beam different from the second default beam, wherein the scheduling is for simultaneously receiving both the first downlink communication and the second downlink communication at the UE. The operations of 1815 may be performed according to the methods described herein. In some examples, aspects of the operations of 1815 may be performed by a beam management component as described with reference to FIGS. 10 to 13.

[0225] FIG. 19 shows a flow chart illustrating a method 1900 for supporting a default transmission beam for multiple transmit-receive points in wireless communication according to various aspects of the present disclosure. The operations of the method 1900 may be implemented by a base station 105 or a component thereof as described herein. For example, the operations of the method 1900 may be performed by a communication manager as described with reference to FIGS. 10 to 13. In some examples, the base station may execute a set of instructions to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described below.

[0226] At 1905, the base station may identify a mapping between one or more control resource sets and one or more default beams for each of a first transmission-reception point and a second transmission-reception point, wherein the mapping indicates one or more default beams for the second transmission-reception point that allow downlink communications from two or more transmission-reception points to be simultaneously received at the UE. The operations of 1905 may be performed according to the methods described herein. In some examples, aspects of the operations of 1905 may be performed by a beam mapping manager as described with reference to FIGS. 10 to 13.

[0227] At 1910, the base station may determine a first default beam for a first transmit-receive point. The operations of 1910 may be performed according to the methods described herein. In some examples, aspects of the operations of 1910 may be performed by a default beam manager as described with reference to FIGS. 10 to 13.

[0228] At 1915, the base station may select a second default beam for the second transmit-receive point based on the mapping. The operations of 1915 may be performed according to the methods described herein. In some examples, aspects of the operations of 1915 may be performed by a default beam manager as described with reference to FIGS. 10 to 13.

[0229] At 1920, the base station may, in response to the determination and the selection, schedule the first transmit-receive point to transmit the first downlink communication using the first default beam, and schedule the second transmit-receive point to transmit the second downlink communication using the second beam different from the second default beam, wherein the first downlink communication and the second downlink communication are scheduled to be received at the UE simultaneously. The operations of 1920 may be performed according to the methods described herein. In some examples, aspects of the operations of 1920 may be performed by a beam management component as described with reference to FIGS. 10 to 13.

[0230] FIG. 20 shows a flow chart illustrating a method 2000 for supporting a default transmission beam for multiple transmit-receive points in wireless communication according to aspects of the present disclosure. The operations of the method 2000 may be implemented by a base station 105 or a component thereof as described herein. For example, the operations of the method 2000 may be performed by a communication manager as described with reference to FIGS. 10 to 13. In some examples, the base station may execute a set of instructions to control functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described below.

[0231] At 2005, the base station may send configuration information to the UE, indicating a first default beam for receiving downlink communications from a first transmission-reception point and a second default beam for receiving downlink communications from a second transmission-reception point, wherein one or more of the first default beam or the second default beam is independent of an associated control transmission beam for transmitting control information to the UE. The operations of 2005 may be performed according to the methods described herein. In some examples, aspects of the operations of 2005 may be performed by a beam configuration component as described with reference to FIGS. 10 to 13.

[0232] At 2010, the base station may identify that a time offset between a physical downlink control channel communication and a physical downlink shared channel communication of each of the first transmission-reception point and the second transmission-reception point is below a threshold. The operations of 2010 may be performed according to the methods described herein. In some examples, aspects of the operations of 2010 may be performed by a default beam manager as described with reference to FIGS. 10 to 13.

[0233] At 2015, the base station may, in response to the identification, schedule the first transmit-receive point to send the first downlink communication using the first default beam, and schedule the second transmit-receive point to send the second downlink communication using the second default beam, wherein the scheduling is for simultaneously receiving both the first downlink communication and the second downlink communication at the UE. The operations of 2015 may be performed according to the methods described herein. In some examples, aspects of the operations of 2015 may be performed by a beam management component as described with reference to FIGS. 10 to 13.

[0234] It should be noted that the methods described herein describe possible implementations, and that the operations and steps may be rearranged or otherwise modified and other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0235] The techniques described herein may be used in various wireless communication systems, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA) and other systems. A CDMA system may implement radio technologies such as CDMA2000, Universal Terrestrial Radio Access (UTRA). CDMA2000 covers IS-2000, IS-95 and IS-856 standards. IS-2000 Releases are commonly referred to as CDMA2000 1X, 1X, etc. IS-856 (TIA-856) is commonly referred to as CDMA2000 1xEV-DO, High Speed ​​Packet Data (HRPD), etc. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. A TDMA system may implement radio technologies such as Global System for Mobile Communications (GSM).

[0236] OFDMA systems may implement radio technologies such as Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and others. UTRA and E-UTRA are part of Universal Mobile Telecommunications System (UMTS). LTE, LTE-A, and LTE-A Pro are releases that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, LTE-A Pro, NR, and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3GPP). CDMA2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). The techniques described herein may be used for the systems and radio technologies mentioned herein as well as other systems and radio technologies. Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR applications.

[0237] A macro cell typically covers a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access to UEs with a network provider service subscription. Small cells may be associated with lower-power base stations than macro cells, and small cells may operate in the same or different frequency bands (e.g., authorized, unauthorized, etc.) as macro cells. According to various examples, small cells may include pico cells, femto cells, and micro cells. For example, a pico cell may cover a small geographic area and may allow unrestricted access to UEs with a network provider service subscription. A femto cell may also cover a small geographic area (e.g., a home) and may provide restricted access to UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs of users in a home, etc.). An eNB for a macro cell may be referred to as a macro eNB. An eNB for a small cell may be referred to as a small cell eNB, a pico eNB, a femto eNB, or a home eNB. An eNB may support one or more (e.g., two, three, four, etc.) cells and may also support communications using one or more component carriers.

[0238] The wireless communication systems described herein may support synchronous or asynchronous operation. For synchronous operation, the base stations may have similar frame timing, and transmissions from different base stations may be approximately aligned in time. For asynchronous operation, the base stations may have different frame timing, and transmissions from different base stations may not be aligned in time. The techniques described herein may be used for synchronous or asynchronous operation.

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

[0240] The various illustrative blocks and modules described in conjunction with the disclosure herein may be implemented or executed with a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any conventional 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, a plurality of microprocessors, one or more microprocessors in combination with a DSP core, or any other such configuration).

[0241] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored or transmitted as one or more instructions or codes on 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 may be implemented using software executed by a processor, hardware, firmware, hard wiring, or a combination of any of these. Features that implement the functions may also be physically located in different locations, including being distributed so that parts of the functions are implemented in different physical locations.

[0242] Computer-readable media include non-transitory computer storage media and communication media, including any media that facilitates the transfer of computer programs from one place to another. Non-transitory storage media can be any available media that can be accessed by a general or special purpose computer. By way of example and not limitation, non-transitory computer-readable media can include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory media that can be used to carry or store the required program code means in the form of instructions or data structures and can be accessed by a general or special purpose computer or a general or special purpose processor. In addition, any connection is properly referred to as a computer-readable medium. For example, if the 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 the coaxial cable, fiber optic cable, twisted pair, DSL or wireless technologies such as infrared, radio and microwave are all included in the definition of medium. As used herein, Disk and disc include CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc where discs usually reproduce data magnetically, while disks reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

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

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

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

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

Claims

1. An apparatus for wireless communication at a user equipment (UE), comprising: means for identifying a mapping between one or more sets of control resources and one or more default beams for each of the first transmit-receive point and the second transmit-receive point, wherein the mapping indicates the one or more default beams for the second transmit-receive point that allow for simultaneous reception of downlink communications from two or more transmit-receive points; means for determining a first default beam for a first transmit-receive point; means for selecting a second default beam for a second transmit-receive point based at least in part on the mapping; as well as Means for receiving simultaneous downlink communications from a first transmit-receive point using a first default beam and from a second transmit-receive point using a second default beam.

2. The device according to claim 1, wherein: The mapping indicates a first subset of control resource sets for a first transmit-receive point and a second subset of control resource sets for a second transmit-receive point, each control resource set having an associated default beam, and wherein the first subset of control resource sets and the second subset of control resource sets do not overlap; as well as A first default beam is determined based at least in part on a first subset of the set of control resources, and a second default beam is determined based at least in part on a second subset of the set of control resources.

3. The device according to claim 2, wherein: Any default beam associated with the first subset of the set of control resources can be received at the UE simultaneously with any default beam associated with the second subset of the set of control resources.

4. The device according to claim 1, wherein: A first default beam for a first transmit-receive point is determined based on a control resource set received by a downlink control channel at the UE, and a second default beam is mapped to the first default beam, and wherein the mapping specifies that the second default beam does not correspond to any configured control resource set of the first transmit-receive point.

5. An apparatus for wireless communication at a user equipment (UE), comprising: means for receiving configuration information from a base station, the configuration information indicating a first default beam for receiving downlink transmissions from a first transmit-receive point and a second default beam for receiving downlink transmissions from a second transmit-receive point, wherein one or more of the first default beam or the second default beam is independent of an associated control transmission beam for transmitting control information to a UE; means for identifying that a time offset between a physical downlink control channel transmission and a physical downlink shared channel transmission of each of the first transmit-receive point and the second transmit-receive point is below a threshold; as well as Means for simultaneously receiving a first default beam from a first transmit-receive point and a second default beam from a second transmit-receive point based at least in part on identifying that a time offset is below a threshold.

6. The device according to claim 5, wherein: Configuration information from the base station is received in a Medium Access Control (MAC) Control Element (CE).

7. The device according to claim 5, wherein: The first default beam is determined at least in part based on an associated control transmission beam of the first transmit-receive point, and the second default beam is explicitly indicated in the configuration information.

8. An apparatus for wireless communication at a base station, comprising: means for identifying a first default beam for transmitting a first downlink communication from a first transmit-receive point to a UE and a second default beam for transmitting a second downlink communication from a second transmit-receive point to the UE; means for determining that the first default beam and the second default beam cannot be simultaneously received at the UE; as well as A component for scheduling a first transmit-receive point to send a first downlink communication using a first default beam and scheduling a second transmit-receive point to send a second downlink communication using a second beam different from the second default beam in response to determining and based at least in part on a predetermined priority rule, wherein the scheduling is used to simultaneously receive both the first downlink communication and the second downlink communication at a UE.

9. The apparatus according to claim 8, further comprising: Means for determining that a first transmit-receive point is associated with a first control resource set group and a second transmit-receive point is associated with a second control resource set group, wherein the first control resource set group is associated with a first default beam and the second control resource set group is associated with a second default beam, and wherein a predetermined priority rule indicates which of the first control resource set group or the second control resource set group has a higher priority.

10. The device according to claim 9, wherein: The predetermined priority rule indicates a pre-designated priority of the first control resource set group and the second control resource set group.

11. The apparatus according to claim 9, further comprising: Means for sending an indication to the UE indicating which of the first control resource set group or the second control resource set group has a higher priority.

12. The apparatus according to claim 9, further comprising: means for determining one or more parameters for each of the first control resource set group and the second control resource set group, wherein the predetermined priority rule is based at least in part on the determined one or more parameters, and The one or more parameters include one or more of the number of control resource sets in each of the first control resource set group and the second control resource set group, the search space monitoring period of each of the first control resource set group and the second control resource set group, or any combination thereof.

13. The device according to claim 8, wherein: The predetermined priority rule specifies that the priorities of different transmit-receive points can be changed based on one or more parameters, and wherein the one or more parameters include transmission time slots, and wherein a first default beam of a first transmit-receive point is selected for a first subset of transmission time slots, and a second default beam of a second transmit-receive point is selected for a second subset of transmission time slots.

14. An apparatus for wireless communication at a base station, comprising: means for identifying a mapping between one or more sets of control resources and one or more default beams for each of a first transmit-receive point and a second transmit-receive point, wherein the mapping indicates the one or more default beams of the second transmit-receive point that allow simultaneous reception of downlink communications from two or more transmit-receive points at the UE; means for determining a first default beam for a first transmit-receive point; means for selecting a second default beam for a second transmit-receive point based at least in part on the mapping; as well as A component for scheduling a first transmit-receive point to send a first downlink communication using a first default beam and scheduling a second transmit-receive point to send a second downlink communication using a second beam different from the second default beam in response to determining and selecting, wherein the scheduling is used to simultaneously receive both the first downlink communication and the second downlink communication at a UE.

15. The device according to claim 14, wherein: The mapping indicates a first subset of control resource sets for a first transmit-receive point and a second subset of control resource sets for a second transmit-receive point, each control resource set having an associated default beam, and wherein the first subset of control resource sets and the second subset of control resource sets do not overlap; as well as A first default beam is determined based at least in part on a first subset of the set of control resources, and a second default beam is determined based at least in part on a second subset of the set of control resources.

16. The device according to claim 15, wherein: Any default beam associated with the first subset of the set of control resources can be received at the UE simultaneously with any default beam associated with the second subset of the set of control resources.

17. The device according to claim 14, wherein: A first default beam for the first transmission-reception point is determined based on a control resource set received on a downlink control channel at the UE, and a second default beam is mapped to the first default beam.

18. An apparatus for wireless communication at a base station, comprising: means for sending configuration information to the UE, the configuration information indicating a first default beam for receiving downlink communications from a first transmit-receive point and a second default beam for receiving downlink communications from a second transmit-receive point, wherein one or more of the first default beam or the second default beam is independent of an associated control transmission beam for transmitting control information to the UE; means for identifying that a time offset between a physical downlink control channel communication and a physical downlink shared channel communication of each of the first transmit-receive point and the second transmit-receive point is below a threshold; as well as Means for scheduling, in response to the identification, a first transmit-receive point to transmit a first downlink communication using a first default beam and a second transmit-receive point to transmit a second downlink communication using a second default beam, wherein the scheduling is for simultaneously receiving both the first downlink communication and the second downlink communication at the UE.

19. The device according to claim 18, wherein: Configuration information from the base station is sent in a Medium Access Control (MAC) Control Element (CE).

20. The device according to claim 18, wherein The first default beam is determined at least in part based on an associated control transmission beam of the first transmit-receive point, and the second default beam is explicitly indicated in the configuration information.

21. A method for wireless communication at a user equipment (UE), comprising: identifying a mapping between one or more sets of control resources and one or more default beams for each of the first transmit-receive point and the second transmit-receive point, wherein the mapping indicates the one or more default beams of the second transmit-receive point that allow simultaneous reception of downlink communications from two or more transmit-receive points; determining a first default beam for a first transmit-receive point; selecting a second default beam for a second transmit-receive point based at least in part on the mapping; as well as Simultaneous downlink communications are received from a first transmit-receive point using a first default beam and from a second transmit-receive point using a second default beam.

22. The method of claim 21, wherein: The mapping indicates a first subset of control resource sets for a first transmit-receive point and a second subset of control resource sets for a second transmit-receive point, each control resource set having an associated default beam, and wherein the first subset of control resource sets and the second subset of control resource sets do not overlap; The first default beam is determined based at least in part on a first subset of the set of control resources, and the second default beam is determined based at least in part on a second subset of the set of control resources, and Therein, any default beam associated with the first subset of the control resource set can be received at the UE simultaneously with any default beam associated with the second subset of the control resource set.

23. The method according to claim 21, wherein: A first default beam for a first transmit-receive point is determined based on a control resource set received on a downlink control channel at the UE, and a second default beam is mapped to the first default beam, and the mapping specifies that the second default beam does not correspond to any configured control resource set of the first transmit-receive point.

24. A method for wireless communication at a user equipment (UE), comprising: receiving configuration information from a base station, the configuration information indicating a first default beam for receiving downlink transmissions from a first transmission-reception point and a second default beam for receiving downlink transmissions from a second transmission-reception point, wherein one or more of the first default beam or the second default beam is independent of an associated control transmission beam for transmitting control information to a UE; identifying that a time offset between a physical downlink control channel transmission and a physical downlink shared channel transmission of each of the first transmission-reception point and the second transmission-reception point is below a threshold; as well as Based at least in part on identifying that the time offset is below a threshold, a first default beam from a first transmit-receive point and a second default beam from a second transmit-receive point are simultaneously received.

25. The method according to claim 24, wherein: Configuration information from the base station is received in a Medium Access Control (MAC) Control Element (CE), wherein the same MAC-CE indicates both the first default beam and the second default beam.

26. A method for wireless communication at a base station, comprising: identifying a first default beam for transmitting a first downlink communication from a first transmit-receive point to a UE and a second default beam for transmitting a second downlink communication from a second transmit-receive point to the UE; Determining that the first default beam and the second default beam cannot be simultaneously received at the UE; as well as In response to determining and based at least in part on a predetermined priority rule, a first transmit-receive point is scheduled to send a first downlink communication using a first default beam, and a second transmit-receive point is scheduled to send a second downlink communication using a second beam different from the second default beam, wherein the scheduling is used to simultaneously receive both the first downlink communication and the second downlink communication at the UE.

27. The method according to claim 26, further comprising: determining that a first transmit-receive point is associated with a first control resource set group and a second transmit-receive point is associated with a second control resource set group, wherein the first control resource set group is associated with a first default beam and the second control resource set group is associated with a second default beam, and wherein a predetermined priority rule indicates which of the first control resource set group or the second control resource set group has a higher priority; as well as An indication is sent to the UE indicating which of the first control resource set group or the second control resource set group has a higher priority.

28. The method according to claim 27, further comprising: Determine one or more parameters for each of the first control resource set group and the second control resource set group, wherein the predetermined priority rule is based at least in part on the determined one or more parameters, wherein the one or more parameters include one or more of the number of control resource sets in each of the first control resource set group and the second control resource set group, the search space monitoring period of each of the first control resource set group and the second control resource set group, or any combination thereof.

29. The method according to claim 26, wherein: The predetermined priority rule specifies that the priorities of different transmit-receive points can be changed based on one or more parameters, and wherein the one or more parameters include transmission time slots, and wherein a first default beam of a first transmit-receive point is selected for a first subset of transmission time slots, and a second default beam of a second transmit-receive point is selected for a second subset of transmission time slots.

30. A method for wireless communication at a base station, comprising: identifying a mapping between one or more control resource sets and one or more default beams for each of a first transmit-receive point and a second transmit-receive point, wherein the mapping indicates the one or more default beams of the second transmit-receive point that allow simultaneous reception of downlink communications from two or more transmit-receive points at the UE; determining a first default beam for a first transmit-receive point; selecting a second default beam for a second transmit-receive point based at least in part on the mapping; as well as In response to the determination and selection, the first transmit-receive point is scheduled to send a first downlink communication using a first default beam, and the second transmit-receive point is scheduled to send a second downlink communication beam using a second beam different from the second default beam, wherein the scheduling is used to simultaneously receive both the first downlink communication and the second downlink communication at the UE.

31. The method of claim 30, wherein: The mapping indicates a first subset of control resource sets for a first transmit-receive point and a second subset of control resource sets for a second transmit-receive point, each control resource set having an associated default beam, and wherein the first subset of control resource sets and the second subset of control resource sets do not overlap; as well as The first default beam is determined based at least in part on the first subset of the set of control resources, and the second default beam is determined based at least in part on the second subset of the set of control resources.

32. The method of claim 30, wherein: A first default beam for the first transmission-reception point is determined based on a control resource set received on a downlink control channel at the UE, and a second default beam is mapped to the first default beam.

33. A method for wireless communication at a base station, comprising: sending configuration information to the UE, the configuration information indicating a first default beam for receiving downlink communications from a first transmission-reception point and a second default beam for receiving downlink communications from a second transmission-reception point, wherein one or more of the first default beam or the second default beam is independent of an associated control transmission beam for transmitting control information to the UE; identifying that a time offset between physical downlink control channel communications and physical downlink shared channel communications of each of the first transmit-receive point and the second transmit-receive point is below a threshold; as well as In response to the identification, the first transmit-receive point is scheduled to send a first downlink communication using a first default beam and the second transmit-receive point is scheduled to send a second downlink communication using a second default beam, wherein the scheduling is for simultaneously receiving both the first downlink communication and the second downlink communication at the UE.

34. The method of claim 33, wherein: Configuration information from the base station is sent in a Medium Access Control (MAC) Control Element (CE).

35. The method of claim 33, wherein: The first default beam is determined based at least in part on an associated control transmission beam of the first transmit-receive point, and the second default beam is explicitly indicated in the configuration information.

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