Common default beam for each component carrier group

Abstract

A wireless communication system may support the identification or determination of a common default beam for a component carrier (CC) group (e.g., such that all CCs in the CC group can be associated with the same default beam). For example, a CC group may be configured or established to include one or more CCs (e.g., for carrier aggregation), where each CC group may share the same analog beamformer. Thus, a beam (e.g., a default uplink / downlink beam) may be established as default or common across the CCs in the CC group (e.g., relative to the default beam configured or established for an individual CC). This established default beam for the CC group (e.g., a common default beam for all CCs in the CC group) may include or refer to a default downlink shared channel beam, a default sounding reference signal (SRS) beam, a default downlink control channel beam, etc.

Description

[0001] Cross-reference

[0002] This patent application claims the benefit of U.S. Provisional Patent Application No. 62 / 938,208, filed Nov. 20, 2019, by Zhou et al., entitled “Common Default Beam Per Component Carrier Group,” and U.S. Patent Application No. 17 / 026,023, filed Sep. 18, 2020, by Zhou et al., entitled “Common Default Beam Per Component Carrier Group,” each of which is assigned to the assignee of this application.

[0003] Background

[0004] The following generally relates to wireless communication and, more particularly, to a common default beam for each component carrier (CC) group.

[0005] Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing available system resources such as time, frequency, and power. Examples of such multi-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 that may be referred to as New Radio (NR) systems. These systems may employ various 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 multi-access communication system may include several base stations or network access nodes, each of which simultaneously supports communication of multiple communication devices, which may also be referred to as user equipment (UE).

[0006] Various communication systems may use different frequency bands depending on the specific requirements of the system. For example, in scenarios where a large number of dense UEs are relatively close to each other and / or where a relatively large amount of data is to be transmitted from a base station to one or more UEs (and vice versa), millimeter wave frequency bands (which may be between 30 GHz and 300 GHz) may be used. However, millimeter wavelength signals may frequently experience high path loss, and as a result, directional beamforming techniques may be used for uplink and / or downlink transmissions between a base station and a UE using millimeter wavelength frequencies. Directional beamforming techniques may enable a transmitter to direct a signal along a specific propagation path and may enable a receiver to receive a signal from a specific propagation path.

[0007] Overview

[0008] The described techniques relate to improved methods, systems, devices, and apparatuses for supporting a common default beam for each component carrier (CC) group. Generally, the described techniques provide for the identification or determination of a common default beam for a CC group (e.g., such that all CCs of the CC group are associated with the same default beam). For example, a CC group may be configured or established to include one or more CCs (e.g., for carrier aggregation). In some cases, each CC group may share the same analog beamformer. Thus, a beam (e.g., a default uplink / downlink beam) may be established as default or common across the CCs of the CC group (e.g., relative to the default beams of the individual CCs configured or established for the CC group). The default beam of a CC group (e.g., a default uplink / downlink beam) may include or refer to a default downlink shared channel beam (e.g., a default physical downlink shared channel (PDSCH) beam), a sounding reference signal (SRS) beam, a default physical downlink control channel (PDCCH) beam, etc.

[0009] According to some aspects, the default beam for a CC group may be set to the default beam of a certain CC within the CC group. For example, the default beam may be determined for a certain CC of the CC group, and the default beam may be applied to all other CCs within the CC group. In some cases, the CC used to determine or identify the default beam for the CC group may be established (e.g., preconfigured or determined) by the network or wireless communication system (e.g., in some cases, the CC with the lowest CC index within the CC group may be used by a communication device to determine the default beam for the CC group). In some cases, the CC used to determine or identify the default beam for the CC group may be selected by a first device, and the first device may then indicate the selected CC to a second device (e.g., such that the first device and the second device may use the same CC in the CC group to identify the default beam of the CC group).

[0010] According to some aspects, the default beam for a CC group may be indicated by a base station. For example, in some cases, Radio Resource Control (RRC) signaling, Media Access Control (MAC) Control Element (CE), Downlink Control Information (DCI), or any combination thereof may be used to indicate the default beam for a CC group. In some cases, the default beam may be identified based on a common Transmission Configuration Indicator (TCI) state or spatial relation information. In some examples (e.g., in a scenario where the base station employs multiple Transmission / Reception Points (TRPs)), a common default beam (multiple default beams) for simultaneous receive / transmit communication may be established (e.g., a default beam may be identified / established for each TRP).

[0011] A method for wireless communication at a first device is described. The method may include: identifying a set of component carriers in a component carrier group; identifying a default beam applicable to each component carrier in the set of component carriers in the component carrier group; and communicating with a second device based on the identified default beam and at least one component carrier in the set of component carriers.

[0012] An apparatus for wireless communication at a first device 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 set of component carriers in a component carrier group; identify a default beam applicable to each component carrier in the set of component carriers in the component carrier group; and communicate with a second device based on the identified default beam and at least one component carrier in the set of component carriers.

[0013] Another apparatus for wireless communication at a first device is described. The apparatus may include means for: identifying a set of component carriers in a component carrier group; identifying a default beam applicable to each component carrier in the set of component carriers in the component carrier group; and communicating with a second device based on the identified default beam and at least one component carrier in the set of component carriers.

[0014] A non-transitory computer-readable medium storing code for wireless communication at a first device is described. The code may include instructions executable by a processor for: identifying a set of component carriers in a component carrier group; identifying a default beam applicable to each component carrier in the set of component carriers in the component carrier group; and communicating with a second device based on the identified default beam and at least one component carrier in the set of component carriers.

[0015] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: transmitting an indication of the identified set of component carriers included in the component carrier group. Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: receiving an indication of a set of component carriers included in the component carrier group, wherein the set of component carriers in the component carrier group may be identified based on the received indication. In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, identifying the default beam may include operations, features, apparatus, or instructions for the following actions: identifying the default beam based on the lowest control resource set identifier.

[0016] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, identifying the default beam may include operations, features, apparatus, or instructions for the following actions: identifying the default beam based on the configured primary cell. In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, identifying the default beam may include operations, features, apparatus, or instructions for the following actions: identifying the default beam based on the configured secondary cell. In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, identifying the default beam may include operations, features, apparatus, or instructions for the following actions: identifying the default beam based on the lowest component carrier index associated with the set of component carriers.

[0017] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, identifying the default beam may include operations, features, apparatus, or instructions for the following actions: identifying the default beam based on the highest component carrier index associated with the set of component carriers. Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: identifying one or more transmission configuration indication states that are active for a cell associated with a second device, wherein the default beam may be identified based on the lowest transmission configuration indication state identifier among the identified one or more transmission configuration indication states that are active for the cell.

[0018] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: transmitting an indication of the identified default beam to a second device, wherein the communication may be based on the transmitted indication. In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the indication of the identified default beam includes a common transport configuration indication state. In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the indication of the identified default beam includes spatial relation information. In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, transmitting the indication of the identified default beam may include operations, features, apparatus, or instructions for the following actions: transmitting a set of multiple default beams for simultaneous transmit / receive communication with the second device. In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, each default beam in the set of multiple default beams corresponds to a transmit / receive point of the first device.

[0019] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, identifying the default beam may include operations, features, apparatus, or instructions for the following actions: identifying the default beam based on a spatial division multiplexing mode, a time division multiplexing mode, a frequency division multiplexing mode, or some combination thereof. Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: receiving an indication of the default beam from the second device, wherein the default beam may be identified based on the received indication. In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the set of component carriers shares an analog beamformer at the first device. In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the set of component carriers shares an analog beamformer at the second device. In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the default beam includes a default uplink beam, a default downlink beam, or both.

[0020] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: determining a path loss of the default beam; and associating the determined path loss with one or more other component carriers in the set of component carriers. Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: associating the determined path loss across the component carriers of the transmit / receive point to which the default beam belongs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Illustrates an example of a system for wireless communication that supports a common default beam per component carrier (CC) group, in accordance with aspects of the present disclosure.

[0022] Figure 2 Illustrates an example of a wireless communication system that supports a common default beam per CC group, in accordance with aspects of the present disclosure.

[0023] Figure 3 Illustrates an example of a control resource set (CORESET) configuration that supports a common default beam per CC group, in accordance with aspects of the present disclosure.

[0024] Figure 4 Illustrates an example of a process flow that supports a common default beam per CC group, in accordance with aspects of the present disclosure.

[0025] Figure 5 and 6 Shows a diagram of an apparatus that supports a common default beam per CC group, in accordance with aspects of the present disclosure.

[0026] Figure 7 Illustrates a diagram of a communication manager that supports a common default beam per CC group, in accordance with aspects of the present disclosure.

[0027] Figure 8 Illustrates a diagram of a system that includes an apparatus that supports a common default beam per CC group, in accordance with aspects of the present disclosure.

[0028] Figure 9 and 10 Shows a flowchart of a method that supports a common default beam per CC group, in accordance with aspects of the present disclosure. DETAILED DESCRIPTION

[0029] Various communication systems may use different frequency bands depending on the specific requirements of the system. For example, in scenarios where a large number of dense user equipments (UEs) are relatively close to each other and / or where a relatively large amount of data is to be transmitted from a base station to one or more UEs (and vice versa), a millimeter wave frequency band (which may be between 30 GHz and 300 GHz) may be used. However, millimeter wavelength signals may experience high path loss, and as a result, directional beamforming techniques may be used for uplink and / or downlink transmissions between a base station using millimeter wavelength frequencies and a UE. Directional beamforming techniques may enable a transmitter to direct a signal onto a specific propagation path and may enable a receiver to receive a signal from a specific propagation path (e.g., since there may be more than one signal propagation path between a UE and a base station).

[0030] For example, a base station and a UE may each use multiple antennas when communicating with each other. The multiple antennas at the base station and the UE may be used to utilize antenna diversity schemes that may improve communication rate and / or throughput reliability. Different types of techniques may be used to implement antenna diversity schemes. For example, for a single data stream, transmit diversity may be applied to increase the signal-to-noise ratio (SNR) at the receiver. Spatial diversity may be applied to increase the data rate by transmitting multiple independent streams using multiple antennas. Receive diversity may be used to combine signals received at multiple receive antennas to improve the received signal quality and increase fading resistance.

[0031] In addition, some wireless communication systems may support communicating with a UE on multiple cells or carriers, which is a feature that may be referred to as carrier aggregation or multi-carrier operation. A UE may be configured with multiple downlink component carriers (CCs) and one or more uplink CCs according to a carrier aggregation configuration. Carrier aggregation may be used in conjunction with both frequency division duplexing (FDD) and time division duplexing (TDD) CCs. In some cases, a UE may receive a physical downlink control channel (PDSCH) transmission that includes control information for decoding subsequent physical downlink shared channel (PDSCH) transmissions. 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 base station may send a PDSCH transmission that is temporally close to or overlaps with a PDCCH transmission. If the offset between the PDCCH transmission and the PDSCH transmission is below a time threshold, the UE may not have enough time to decode the control information in the PDCCH to configure its receiving parameters for receiving and decoding the PDSCH transmission. Accordingly, the UE and the base station may configure a default beam for buffering the PDSCH transmission while the UE receives and decodes the PDCCH control information.

[0032] However, in some cases, the default beam can be determined separately for each CC, and in cases where the default beams are not compatible (e.g., where the default beams vary across CCs at a given time, where the default beams cannot be received concurrently at the UE, etc.), UE 115 can prioritize one default beam based on its own implementation (which may result in other CCs using a beam different from the default beam prioritized / used by UE 115, or the base station assuming a beam different from the default beam prioritized / used by UE 115 for transmission). For example, the UE may use an antenna panel that can transmit / receive one beam at a time, and thus if the CCs have default beams using the same antenna panel at the UE at a given time, the UE may not be able to communicate concurrently using two CCs (or the UE may communicate by using the default beam of the first CC for the second CC, and the second CC may not be associated with the default beam of the first CC).

[0033] Thus, according to the techniques described herein, a wireless communication system can support the identification or determination of a common default beam for a CC group such that all CCs in the CC group can be associated with the same default beam. For example, a CC group can be configured or established to include one or more CCs (e.g., for carrier aggregation). In some cases, each CC group can share the same analog beamformer. Thus, relative to the default beams configured or established for individual CCs, a beam (e.g., a default uplink / downlink beam) can be established as default or common across the CCs in the CC group. This established default beam for the CC group can include or refer to a default downlink shared channel beam (e.g., a default PDSCH beam), a default sounding reference signal (SRS) beam, a default PDCCH beam, etc. Additionally, the default beam for a CC group can include or refer to a default downlink beam, a default uplink beam, and / or a default beam for both uplink and downlink.

[0034] Such techniques can support efficient communication between the UE and the base station to improve throughput or improve the reliability of communication. For example, when operating using the CCs in a CC group, the UE can use the same default beam across the CCs in the CC group at a given time, resulting in improved throughput, improved reliability (e.g., a higher likelihood of the UE receiving data), etc. The techniques discussed herein can further enhance such reliability, throughput, or both.

[0035] Aspects of the present disclosure are initially described in the context of a wireless communication system. Subsequently, example control resource set (CORESET) configurations and example process flows are described that illustrate aspects of the techniques discussed herein. Aspects of the present disclosure are further illustrated and described with reference to apparatus diagrams, diagrams, and flowcharts related to a common default beam for each CC group.

[0036] Figure 1 An example of a wireless communication system 100 that supports a shared default beam for each CC group in accordance with aspects of the present disclosure is described. 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 scenarios, 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.

[0037] The base station 105 may 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 station, a radio base station, an access point, a radio transceiver, a Node B, an evolved Node B (eNB), a next-generation Node B, or a giga Node B (any of which may be referred to as a gNB), a home Node B, a home evolved Node B, or some other suitable term. 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 may be capable of communicating with various types of base stations 105 and network equipment, including macro eNBs, small cell eNBs, gNBs, relay base stations, and the like.

[0038] Each base station 105 may be associated with a particular geographic coverage area 110 in which communication with various UEs 115 is supported. Each base station 105 may provide communication coverage for the 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. The downlink transmission may also be referred to as a forward link transmission, and the uplink transmission may also be referred to as a reverse link transmission.

[0039] The geographical coverage area 110 of base station 105 can be divided into sectors that form part of the geographical coverage area 110, and each sector can be associated with a cell. For example, each base station 105 can provide communication coverage for macro cells, small cells, hotspots, or other types of cells, or various combinations thereof. In some examples, base station 105 can be mobile and thus provide communication coverage for a mobile geographical coverage area 110. In some examples, different geographical coverage areas 110 associated with different technologies can overlap, and the overlapping geographical 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 can include, for example, a heterogeneous LTE / LTE-A / LTE-A Pro or NR network, where different types of base stations 105 provide coverage for various geographical coverage areas 110.

[0040] The term "cell" refers to a logical communication entity used to communicate with a base station 105 (e.g., on a carrier), and can be associated with an identifier to distinguish adjacent cells operating via the same or different carriers (e.g., Physical Cell Identifier (PCID), Virtual Cell Identifier (VCID)). In some examples, a carrier can support multiple cells, and different cells can be configured according to different protocol types that can provide access for different types of devices (e.g., Machine-Type Communication (MTC), Narrowband Internet of Things (NB-IoT), Enhanced Mobile Broadband (eMBB), or others). In some cases, the term "cell" can refer to a part (e.g., a sector) of the geographical coverage area 110 on which the logical entity operates.

[0041] Each UE 115 can be dispersed throughout the wireless communication system 100, and each UE 115 can be stationary or mobile. UE 115 can also be referred to as a mobile device, wireless device, remote device, handheld device, or subscriber device, or some other suitable term, where "device" can also be referred to as a unit, station, terminal, or client. UE 115 can also be a personal electronic device, such as a cellular phone, Personal Digital Assistant (PDA), tablet computer, laptop computer, or personal computer. In some examples, UE 115 can also refer to a Wireless Local Loop (WLL) station, Internet of Things (IoT) device, Internet of Everything (IoE) device, or MTC device, etc., which can be implemented in various items (such as appliances, vehicles, meters, etc.).

[0042] Some UEs 115 (such as MTC or IoT devices) can be low-cost or low-complexity devices and can provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC can refer to data communication technologies that allow devices to communicate with each other or with the base station 105 without human intervention. In some examples, M2M communication or MTC can include communication from devices integrated with sensors or meters to measure or capture information and relay that information to a central server or application, which can utilize the information or present the information to a person interacting with the program or application. Some UEs 115 can be designed to collect information or implement automated behavior of machines. Examples of applications for MTC devices include: smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, field survival monitoring, weather and geographical event monitoring, queue management and tracking, remote security sensing, physical access control, and transaction-based commercial charging.

[0043] Some UEs 115 can be configured to operate in power-saving modes, 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 can be performed at a reduced peak rate. Other power-saving techniques for UEs 115 include entering a power-saving "deep sleep" mode when not participating in active communication, or operating on a limited bandwidth (e.g., according to narrowband communication). In some cases, UEs 115 can be designed to support critical functions (e.g., mission-critical functions), and the wireless communication system 100 can be configured to provide ultra-reliable communication for these functions.

[0044] In some cases, UEs 115 can also be able to communicate directly with other UEs 115 (e.g., using peer-to-peer (P2P) or device-to-device (D2D) protocols). One or more UEs in a group of UEs 115 that utilize D2D communication can be within the geographical coverage area 110 of the base station 105. Other UEs 115 in the group can be outside the geographical coverage area 110 of the base station 105 or otherwise unable to receive transmissions from the base station 105. In some cases, each group of UEs 115 that communicate via D2D communication can utilize a one-to-many (1:M) system, where each UE 115 transmits to each other UE 115 in the group. In some cases, the base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between UEs 115 without involving the base station 105.

[0045] Base station 105 can communicate with core network 130 and with each other. For example, base station 105 can interface with core network 130 via a backhaul link 132 (e.g., via S1, N2, N3, or other interfaces). Base station 105 can communicate with each other directly (e.g., directly between base stations 105) or indirectly (e.g., via core network 130) over a backhaul link 134 (e.g., via X2, Xn, or other interfaces).

[0046] Core network 130 can provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. Core network 130 can be an evolved packet core (EPC), which can include at least one mobility management entity (MME), at least one serving gateway (S-GW), and at least one packet data network (PDN) gateway (P-GW). The MME can manage non-access stratum (e.g., control plane) functions such as mobility, authentication, and bearer management of UE 115 served by base station 105 associated with the EPC. User IP packets can be relayed through the S-GW, which can itself be connected to the P-GW. The P-GW can provide IP address allocation and other functions. The P-GW can be connected to network operator IP services. The operator IP services can include access to the Internet, an intranet, an IP multimedia subsystem (IMS), or packet-switched (PS) streaming services.

[0047] At least some network devices (such as base station 105) can include sub-components, such as an access network entity, which can be an example of an access node controller (ANC). Each access network entity can communicate with respective UEs 115 through several other access network transmission entities, which can be referred to as radio heads, intelligent radio heads, or TRPs. In some configurations, the various functions of each access network entity or base station 105 can be distributed across various network devices (e.g., radio heads and access network controllers) or consolidated into a single network device (e.g., base station 105).

[0048] Wireless communication system 100 can operate using one or more frequency bands, generally in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Generally, the 300 MHz to 3 GHz division is known as the ultra-high frequency (UHF) division or the decimeter band because the wavelengths range from approximately one decimeter to one meter in length. UHF waves can be blocked or redirected by buildings and environmental features. However, these waves can penetrate various structures sufficiently for macro cells to serve UEs 115 located indoors. Transmission of UHF waves can be associated with smaller antennas and shorter ranges (e.g., less than 100 km) compared to transmissions using smaller frequencies and longer waves in the higher frequency (HF) or very high frequency (VHF) portions of the spectrum.

[0049] Wireless communication system 100 may also operate in the super high frequency (SHF) band (also known as the centimeter band) from 3 GHz to 30 GHz. The SHF band includes bands that can be opportunistically used by devices that can tolerate interference from other users (such as the 5 GHz industrial, scientific, and medical (ISM) band).

[0050] Wireless communication system 100 may also operate in the extremely high frequency (EHF) band of the spectrum (e.g., from 30 GHz to 300 GHz), which is also known as the millimeter band. In some examples, wireless communication system 100 may support millimeter wave (mmW) communication between UE 115 and base station 105, and the EHF antennas of the corresponding devices may be even smaller and more closely spaced than UHF antennas. In some cases, this may facilitate the use of antenna arrays within UE 115. However, the propagation of EHF transmissions may suffer even greater atmospheric attenuation and shorter range than SHF or UHF transmissions. The techniques disclosed herein may be employed across transmissions using one or more different frequency bands, and the use of frequency bands designated across these frequency bands may vary by country or regulatory body.

[0051] In some cases, wireless communication system 100 may utilize both licensed and unlicensed radio frequency bands. For example, wireless communication system 100 may employ license-assisted access (LAA), Long Term Evolution-Unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band (such as the 5 GHz ISM band). When operating in an unlicensed radio frequency band, wireless devices (such as base station 105 and UE 115) may employ a listen-before-talk (LBT) procedure to ensure that the frequency channel is clear before transmitting data. In some cases, operation in the unlicensed band may be based on a carrier aggregation configuration (e.g., LAA) in coordination with a component carrier operating in a licensed band. Operation in the unlicensed spectrum may include downlink transmissions, uplink transmissions, peer-to-peer transmissions, or a combination of these. Duplexing in the unlicensed spectrum may be based on frequency division duplexing (FDD), time division duplexing (TDD), or a combination of both.

[0052] In some examples, the base station 105 or the UE 115 may be equipped with multiple antennas, which can be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. For example, the wireless communication system 100 may use a transmission scheme between a transmitting device (e.g., the base station 105) and a receiving device (e.g., the UE 115), where the transmitting device is equipped with multiple antennas and the receiving device is equipped with one or more antennas. MIMO communication can utilize multipath signal propagation to increase spectral efficiency by transmitting or receiving multiple signals via different spatial layers, which can be referred to as spatial multiplexing. For example, the transmitting device may transmit multiple signals via different antennas or different combinations of antennas. Similarly, the receiving device may receive multiple signals via different antennas or different combinations of antennas. Each of these multiple signals can be referred to as a separate spatial stream and can carry bits associated with the same data stream (e.g., the same codeword) or different data streams. Different spatial layers can be associated with different antenna ports for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO), where multiple spatial layers are transmitted to the same receiving device; and multi-user MIMO (MU-MIMO), where multiple spatial layers are transmitted to multiple devices.

[0053] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that can be used at a transmitting device or a receiving device (e.g., the base station 105 or the UE 115) to shape or direct 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 can be achieved by combining signals communicated via the antenna elements of an antenna array such that signals propagating in a particular orientation relative to the antenna array experience constructive interference while other signals experience destructive interference. The adjustment of the signals communicated via the antenna elements can include the transmitting device or the receiving device applying a specific amplitude and phase shift to the signals carried via each antenna element associated with the device. The adjustment associated with each antenna element can 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).

[0054] In one example, base station 105 may use multiple antennas or antenna arrays to perform beamforming operations for directional communication with UE 115. For example, some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted multiple times in different directions by base station 105, which may include a signal being transmitted according to different sets of beamforming weights associated with different transmission directions. Transmissions in different beam directions may be used (e.g., by base station 105 or a receiving device, such as UE 115) to identify the beam direction used by base station 105 for subsequent transmissions and / or receptions.

[0055] 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., the direction associated with the receiving device (such as UE 115)). In some examples, the beam direction associated with a transmission in a single beam direction may be determined at least in part based 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 that it receives with the highest signal quality or other 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 use similar techniques for transmitting signals multiple times in different directions (e.g., for identifying the beam direction used by UE 115 for subsequent transmissions or receptions) or for transmitting signals in a single direction (e.g., for transmitting data to a receiving device).

[0056] A receiving device (e.g., UE 115, which may be an example of a mmW receiving device) may attempt multiple receive beams when receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from base station 105. For example, the receiving device may attempt multiple receive directions by: receiving via different antenna sub-arrays, processing received signals according to different antenna sub-arrays, receiving according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of an antenna array, or processing received signals according to different sets of receive beamforming weights 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 use a single receive beam to receive in a single beam direction (e.g., when receiving a data signal). The single receive beam may be aligned in a beam direction determined at least in part based on listening according to different receive beam directions (e.g., a beam direction determined to have the highest signal strength, highest signal-to-noise ratio, or other acceptable signal quality based at least in part on listening according to multiple beam directions).

[0057] In some cases, the antennas of base station 105 or UE 115 may be located within one or more antenna arrays that can support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may co-locate at an antenna assembly such as an antenna tower. In some cases, the antennas or antenna arrays associated with base station 105 may be located at different geographical locations. Base station 105 may have an antenna array that has several rows and columns of antenna ports for beamforming that base station 105 can use to support communication with UE 115. Similarly, UE 115 may have one or more antenna arrays that can support various MIMO or beamforming operations.

[0058] In some cases, wireless communication system 100 may be a packet-based network that operates according to a hierarchical 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 for communication over logical channels. The media access control (MAC) layer may perform priority handling and multiplex logical channels into transport channels. The MAC layer may also use hybrid automatic repeat request (HARQ) to provide MAC layer retransmissions, thereby improving link efficiency. In the control plane, the radio resource control (RRC) protocol layer may provide the establishment, configuration, and maintenance of the RRC connection that supports the radio bearers of user plane data between UE 115 and base station 105 or core network 130. At the physical layer, transport channels may be mapped to physical channels.

[0059] Time intervals in LTE or NR may be expressed as multiples of a basic time unit which may refer to, for example, a sampling period T s = 1 / 30,720,000 seconds). The time intervals of communication resources may be organized according to radio frames each having a duration of 10 milliseconds (ms), where the frame period may be expressed as T f = 307,200T s . The radio frames 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 time slots each having a duration of 0.5 ms, and each time slot may contain 6 or 7 modulation symbol periods (e.g., depending on the length of the cyclic prefix added before 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 wireless communication system 100 and may be referred to as a transmission time interval (TTI). In other cases, the smallest scheduling unit of wireless communication system 100 may be shorter than a subframe or may be dynamically selected (e.g., in a burst of shortened TTI (sTTI) or in a selected component carrier using sTTI).

[0060] In some wireless communication systems, a time slot may be further divided into multiple mini-slots each containing one or more symbols. In some instances, the symbols of a mini-slot or the mini-slot may be the smallest scheduling unit. For example, the duration of each symbol may vary depending on the subcarrier spacing or the operating frequency band. Further, 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.

[0061] The term "carrier" refers to a set of radio frequency spectrum resources that has a defined physical layer structure for supporting communication on communication link 125. For example, the carrier of communication link 125 may include a portion of the radio frequency spectrum band that operates according to the physical layer channels for a given radio access technology. Each physical layer channel may carry user data, control information, or other signaling. The carrier may be associated with a predefined frequency channel (e.g., the evolved universal mobile telecommunications system terrestrial radio access (E-UTRA) absolute radio frequency channel number (EARFCN)) and may be located according to a channel grid for discovery by UE 115. The carrier may be a downlink or an uplink (e.g., in FDD mode), or may be configured to carry both downlink communication and uplink communication (e.g., in TDD mode). In some examples, the signal waveform transmitted on the carrier may include multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)).

[0062] For different radio access technologies (e.g., LTE, LTE-A, LTE-A Pro, NR), the organizational structure of the carrier may be different. For example, the communication on the carrier may be organized according to a transmission time interval (TTI) or a time slot, each of which may include user data as well as 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.

[0063] Physical channels may be multiplexed on the carrier according to various techniques. The physical control channel and the physical data channel may be multiplexed on the downlink carrier using, for example, time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques. In some examples, the control information transmitted in the physical control channel may be distributed in a cascaded manner between different control regions (e.g., between a common control region or a common search space and one or more UE-specific control regions or UE-specific search spaces).

[0064] A carrier may be associated with a specific bandwidth of the radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as the "system bandwidth" of the carrier or the wireless communication system 100. For example, the carrier bandwidth may be one of a plurality of predetermined bandwidths of a carrier of 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 within the carrier (e.g., a set of subcarriers or RBs) (e.g., "in-band" deployment of the narrowband protocol type).

[0065] In a system employing MCM technology, a resource element may include a symbol period (e.g., the duration of a modulated symbol) and a subcarrier, where the symbol period and the subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme). Thus, the more resource elements received by the UE 115 and the higher the order of the modulation scheme, the higher the data rate of the UE 115 can be. In a MIMO system, the wireless communication resources may refer to a combination of radio frequency spectrum resources, time resources, and spatial resources (e.g., spatial layers), and using multiple spatial layers can further increase the data rate of communicating with the UE 115.

[0066] Devices of the wireless communication system 100 (e.g., the base station 105 or the UE 115) may have a hardware configuration that supports communication on a specific carrier bandwidth, or may be configurable to support communication on one of the carrier bandwidths in a carrier bandwidth set. 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 bandwidth.

[0067] The wireless communication system 100 may support communication with the UE 115 on multiple cells or carriers, which is a feature that may be referred to as carrier aggregation or multi-carrier operation. The UE 115 may be configured with multiple downlink component carriers (CCs) and one or more uplink CCs according to a carrier aggregation configuration. Carrier aggregation may be used in conjunction with both FDD CCs and TDD CCs. In some cases, a default beam may be determined separately for each CC, and in cases where the default beams are incompatible (e.g., where the default beams vary across CCs at a given time, where the default beams cannot be received concurrently at the UE 115, etc.), the UE 115 may prioritize one default beam based on its own implementation (which may result in other CCs using a beam different from the default beam prioritized / used by the UE 115, or the base station 105 assuming a beam different from the default beam prioritized / used by the UE 115 for transmission).

[0068] In some deployments, the base station 105 may support communication using one or more transmit receive points (TRPs) to improve reliability, coverage, capacity performance, or a combination thereof. In some cases, the UE 115 may establish beamformed communication links with multiple TRPs to receive and transmit communications with multiple TRPs simultaneously. For example, the UE 115 may receive a physical downlink control channel (PDCCH), decode the control information from the PDCCH, and use the decoded control information to decode subsequent physical downlink shared channel (PDSCH) transmissions.

[0069] When the set of TCI state IDs of the PDSCH is activated by a MAC CE for at least a set of CCs / BWPs for the same frequency band, and in cases where the applicable CC list is indicated by RRC signaling, the same set of TCI state IDs may be applied to the BWPs in the indicated CCs. In some cases, a combination of CCs may be configured by RRC and the associated UE capabilities (e.g., the combination of CCs may be configured by RRC based on UE capabilities related to CC usage, UE capabilities related to carrier aggregation, etc.). In some cases, for the purpose of simultaneous TCI state activation across multiple CCs / BWPs, up to two CC lists may be configured per UE 115 by RRC, and the list to be applied may be determined by the CCs indicated in the MAC CE. In some cases, the UE 115 may not be configured with overlapping CCs in multiple RRC-configured CC lists.

[0070] When activating spatial relation information for semi-periodic / aperiodic sounding reference signal (SRS) resources by means of MAC CE for a CC / BWP set at least for the same frequency band, and in cases where the applicable CC list is indicated by RRC signaling, this spatial relation information can be applied to (the) SP / AP SRS resources with the same SRS resource ID in all BWPs in the indicated CCs. In some cases, for such features, the wireless communication system 100 can support inter-band carrier aggregation. In some cases, the UE 115 can indicate a list of applicable frequency bands for the features of a single MAC-CE to activate the same SRS resource ID for multiple CC / BWPs (e.g., in a capability report). For the purpose of simultaneous TCI state activation across multiple CC / BWPs, up to two CC lists can be configured per UE 115 by RRC, and the applied list can be determined by the CC indicated in the MAC CE. In some cases, the UE 115 may not be configured with overlapping CCs in multiple RRC-configured CC lists. In some cases, these lists can be independent of those used for simultaneous TCI state activation.

[0071] In some wireless communication systems, when the scheduling offset between the DCI and the scheduled PDSCH is less than the beam switching latency (where the beam switching latency can be reported as a UE 115 capability), the default PDSCH beam can be used to receive the PDSCH. When a CC has a configured CORESET, the default PDSCH beam can be determined by means of a quasi-co-location (QCL) assumption regarding receiving the CORESET with the lowest CORESET ID in the latest monitored time slot on the same CC. When a CC does not have a configured CORESET, the default PDSCH beam can be determined by the QCL type D reference signal (RS) in the activated PDSCH TCI state with the lowest TCI state ID on the same CC.

[0072] In some wireless communication systems, the determination of the default SRS / PUCCH beam follows the operations or techniques used for the determination of the default PDSCH beam (e.g., if spatial relation information is not configured for SRS / PUCCH). The default spatial relation for dedicated PUCCH / SRS for a CC (at least when no path loss reference signal is configured via RRC) can be determined by the default TCI state or QCL hypothesis of the PDSCH. For example, when (a) CORESET(s) is / are configured on a CC, the default spatial relation for dedicated PUCCH / SRS for that CC can be determined by the CORESET with the lowest ID in the most recently monitored downlink slot. When no CORESET is configured on a CC, the default spatial relation for dedicated PUCCH / SRS for that CC can be determined by the activated TCI state of the PDSCH with the lowest ID in the active downlink BWP (DL-BWP) applicable to that CC. In some cases, such methods can be applied at least to UE115 that supports beam correspondence, in a single TRP scenario, etc.

[0073] As described herein, the wireless communication system 100 can support the identification or determination of a common default beam for a CC group (e.g., such that all CCs in the CC group can be associated with the same default beam). For example, a CC group can be configured or established to include one or more CCs. In some cases, each CC group can share the same analog beamformer. Thus, relative to the default beams configured or established for individual CCs, a beam (e.g., a default uplink / downlink beam) can be established as default or shared across the CCs in a CC group. This established default beam for the CC group (e.g., a common default beam for all CCs in the CC group) can include or refer to a default downlink shared channel beam (e.g., a default PDSCH beam), a default sounding reference signal (SRS) beam, a default PDCCH beam, etc. Additionally, the default beam for a CC group can include or refer to a default downlink beam, a default uplink beam, and / or a default beam for both uplink and downlink.

[0074] According to some aspects, the default beam for a CC group can be set to the default beam of a certain CC within the CC group. For example, according to any of the techniques described herein, the default beam can be determined for a certain CC in the CC group, and this default beam can be applied to all other CCs within the CC group. In some cases, the CC used to determine or identify the default beam for the CC group can be established (e.g., preconfigured or determined) by the network or wireless communication system (e.g., in some cases, the CC with the lowest CC index within the CC group or the CC with the highest CC index within the CC group can be used by the communication device to determine the default beam for the CC group). In some cases, the CC used to determine or identify the default beam for the CC group can be selected by a first device (e.g., by UE 115 or base station 105), and the first device can then indicate the selected CC to a second device (e.g., so that the first device and the second device can use the same CC in the CC group to identify the default beam of the CC group).

[0075] According to some aspects, the default beam for a CC group can be indicated by the base station. For example, in some cases, radio resource control (RRC) signaling, media access control (MAC) control element (CE), downlink control information (DCI), or any combination thereof can be used to indicate the default beam for the CC group. In some cases, the default beam can be identified based on a common transmission configuration indication (TCI) state or spatial relation information. In some examples (e.g., in a scenario where the base station employs multiple transmit / receive points (TRPs)), a common default beam for simultaneous receive / transmit communication can be established (e.g., a default beam can be identified / established for each TRP).

[0076] Figure 2 An example of a wireless communication system 200 supporting a common default beam per CC group in accordance with aspects of the present disclosure is illustrated. In some examples, the wireless communication system 200 can implement aspects of the wireless communication system 100. The wireless communication system 200 includes a base station 105-a, which can be an example of the base station 105 described with reference to Figure 1 The wireless communication system 200 further includes a UE 115-a, which can be an example of the UE 115 described with reference to Figure 1 The base station 105-a can provide communication coverage for a geographic coverage area 110-a, which can be an example of the coverage area 110 described with reference to Figure 1 The described coverage area 110.

[0077] Generally, the described techniques provide for the configuration, identification, determination, etc. of a default beam for a CC group (e.g., such that all CCs in the CC group are associated with the same default beam). For example, each CC group may share the same analog beamformer (e.g., at UE 115-a). As such, beam 205 (e.g., the default uplink / downlink beam) may be established as default or common across the CCs in the CC group (as opposed to a default beam that is configured or established for an individual CC in the CC group). For example, in a case where two CCs are part of a CC group, both of these CCs may be associated with the same default beam 205-a, rather than the first CC in the CC group being associated with default beam 205-a and the second CC in the CC group being associated with default beam 205-b. The default beam 205-a of the CC group (e.g., the default uplink / downlink beam) may be used for the default downlink shared channel beam (default PDSCH beam), the SRS beam, the default PDCCH beam, etc. In some cases, the default uplink beam and the default downlink beam may be used for the CC group. In some cases, the same beam may be used for both the uplink and the downlink for the CC group.

[0078] As discussed herein, in beam updates based on group CCs, each CC group may share the same analog beamformer (e.g., the CC group may include one or more CCs for communication between UE 115-a and base station 105-a). In a case where a default beam is employed independently for each CC, if the default beam (e.g., the default downlink / uplink beam) varies across the CCs at a given time, the UE may employ prioritization of some CCs (since the UE may default to one beam at a given time). As such, according to the techniques described herein, the default beam 205-a (e.g., the default uplink beam and / or the default downlink beam) may be used as a common (or the same) uplink / downlink beam per CC group. The wireless communication system 200 may employ (e.g., configure, establish, etc.) a common downlink / uplink default beam that is used across multiple CCs (and / or bandwidth parts (BWPs)). For example, the wireless communication system 200 may employ a common downlink / uplink default beam 205-a that is used across all CCs included within a CC group. Such unification of the CCs may reduce the overhead used to configure multiple CCs in the CC group, may reduce the number of beams that the UE 115-a may prioritize for the CCs within the CC group, etc. In some cases, multiple CCs / BWPs may share the same analog beamformer (which may be reported by UE 115-a or indicated by base station 105-a).

[0079] According to some aspects, the default beam 205-a for a CC group can be set to be the default beam of a certain CC within the CC group. For example, the default beam 205-a can be determined for a certain CC in the CC group, and the default beam 205-a can be applied to all other CCs within the CC group. In some cases, the CC used to determine or identify the default beam 205-a for the CC group can be established (e.g., pre-configured or determined) by the network or the wireless communication system 200. For example, in some cases, the CC with the lowest CC index within the CC group can be used by the communication devices (e.g., the base station 105-a and the UE 115-a) to determine the default beam 205-a for the CC group (e.g., the default beam 105-a associated with the CC with the lowest CC index within the CC group can be used to identify the default beam 105-a associated with each CC in the CC group). In some cases, the CC with the highest CC index within the CC group can be used by the communication devices (e.g., the base station 105-a and the UE 115-a) to determine the default beam 205-a for the CC group. In some cases, the secondary cell (SCell) and / or the primary cell (PCell) in the CC group can be used by the communication devices (e.g., the base station 105-a and the UE 115-a) to determine the default beam 205-a for the CC group.

[0080] In some cases, the CC used to determine or identify the default beam for the CC group can be selected by a first device, and the first device can then indicate the selected CC to a second device (so that the first device and the second device can use the same CC in the CC group to identify the default beam of the CC group). For example, a CC from the CC group can be selected by the UE 115-a, and the UE 115-a can transmit an indication of the CC to the base station 105-a (so that both the UE 115-a and the base station 105-a can use the CC selected by the UE 115-a to determine the default beam 205-a for the CC group). In some examples, a CC from the CC group can be selected by the base station 105-a, and the base station 105-a can transmit an indication of the CC to the UE 115-a (so that both the UE 115-a and the base station 105-a can use the CC selected by the UE 115-a to determine the default beam 205-a for the CC group). In some cases, the device (e.g., the UE 115-a or the base station 105-a) that indicates which CCs form the CC group (e.g., the device that indicates CC1, CC2, and CC3 within the CC group) can further indicate which CC in the CC group is used for the default beam 205-a identification.

[0081] In some examples, base station 105-a may be associated with multiple TRPs, and in a multi-DCI based TRP, the default downlink / uplink beam per TRP may follow the lowest CORESET ID of the same TRP. For example, UE 115-a may be configured with a subset of CORESETs for each TRP. In some cases, the first beam for the first TRP may be determined based on the lowest CORESET ID of the first TRP, and subsequently, the second beam for the second TRP may be determined based on the lowest CORESET ID of the second TRP.

[0082] According to some aspects, the default beam for a CC group may be indicated by the base station. For example, in some cases, radio resource control (RRC) signaling, media access control (MAC) control element (CE), downlink control information (DCI), or any combination thereof may be used to indicate the default beam for a CC group. In some cases, the default beam may be signaled via a common transmission configuration indication (TCI) state or spatial relation information. In some examples, a common default beam (e.g., a shared downlink / uplink default beam) may have multiple default beams for simultaneous receive / transmit communications (e.g., in a scenario where the base station employs multiple TRPs, the default beam 205-a for uplink and / or downlink may be per TRP).

[0083] In some examples, the shared downlink / uplink default beam may be signaled via a common TCI state ID or spatial relation information (e.g., the CCs in each CC group may have a common or different pool of configured TCI state or spatial relation information). In some cases, the shared downlink / uplink default beam may have multiple default beams for simultaneous receive / transmit (e.g., in multiple RP configurations). For example, a common set of multiple downlink / uplink default beams may be identified via a set of common TCI state IDs or spatial relation information IDs, which may be further mapped to a common TCI or spatial relation decoding point in a single DCI based TRP. In some cases, the shared downlink / uplink default beam may have a common spatial division multiplexing (SDM) mode, a common time division multiplexing (TDM) mode, a common frequency division multiplexing (FDM) mode, or some combination thereof (e.g., across all CCs in the same group, default beam 1 and default beam 2 may be used on odd-numbered symbols in each time slot, and default beam 3 and default beam 4 may be used on even-numbered symbols in each time slot).

[0084] In some examples, UE 115-a may determine path loss based on a downlink reference signal associated with a default beam of a CC group. Based on this path loss of the default beam, UE 115-a may associate this path loss with one or more component carriers in the CC group other than the default beam. In another example, UE 115-a may associate the path loss of the default beam across component carriers of a transmit / receive point to which the default beam affiliates.

[0085] Figure 3 An example of a CORESET configuration 300 supporting a common default beam per CC group in accordance with aspects of the present disclosure is illustrated. In some examples, CORESET configuration 300 may implement aspects of wireless communication system 100 and / or wireless communication system 200. In this example, in accordance with aspects of the present disclosure, CORESET configuration 300 may be monitored by a UE for control information from multiple TRPs. For example, the UE may monitor CORESET 305 (e.g., having ID#0 and #1) for control information from a first TRP, and monitor CORESET 310 (e.g., having ID#2 and #3) for control information from a second TRP. In other examples, the number of CORESETs assigned to each TRP may vary. In some examples, the lowest CORESET ID in each group of CORESET 305 and CORESET 310 may be used to determine the default beam.

[0086] As indicated above, in some cases, UE 115-a may not be able to concurrently receive default receive beams, such as if multiple default beams (e.g., different default beams associated with different CCs in a CC group, different default beams associated with different TRPs, etc.) are associated with the same antenna panel. For example, in some cases, multiple TRPs may be configured for simultaneous transmission to the UE, where the UE will receive multiple transmissions from multiple TRPs simultaneously.

[0087] In some cases, the default beam for the first TRP (TRP1) may be based on the configured CORESET or CORESETS 305 that the first TRP may monitor for control information. For example, the default beam may be determined based on the CORESET with the lowest CORESET ID, and the TCI state associated with that CORESET may be used to derive the corresponding beamforming parameters. For example, the default receive beam may be derived based on the quasi-co-location (QCL) information of the identified CORESET. In some cases, each TRP (e.g., TRP1 and TRP2) may be configured with a default beam configuration. In some cases, the common default beam for a CC group may be determined based on the CORESET IDs of CORESET 305 and CORESET 310 (e.g., the lowest CORESET ID), based on the CORESET ID of each group of CORESET305 and CORESET 310 (e.g., the lowest CORESET ID), etc.

[0088] Figure 4 An example of a process flow 400 that supports a common default beam per CC group in accordance with aspects of the present disclosure is illustrated. In some examples, process flow 400 may implement aspects of wireless communication system 100, wireless communication system 200, and / or CORESET configuration 300. Process flow 400 includes functions and communications (e.g., for more efficient analog beamforming operations, more efficient CC utilization, etc.) implemented by base station 105-b and UE 115-b in the context of a common default beam per CC group.

[0089] In the following description of process flow 400, the operations between UE 115-b and base station 105-b may be transmitted in an order different from the order shown, or these operations may be performed in a different order or at different times. Certain operations may also be excluded from process flow 400, or other operations may be added to process flow 400. It will be understood that although UE 115-b and base station 105-b are shown as performing several operations of process flow 400, any wireless device may perform one or all of the shown operations.

[0090] At 405, the device may identify a set of CCs in the CC group. For example, at 405-a, UE 115-b may identify a set of CCs in the CC group. Additionally, at 405-b, base station 105-b may identify a set of CCs in the CC group. For example, in some cases, UE 115-b or base station 105-b may determine a set of CCs in the CC group, and UE 115-b or base station 105-b may transmit an indication of the identified CCs to another device (e.g., to another one of UE 115-b or base station 105-b). Thus, in a case where one of UE 115-b or base station 105-b receives an indication of a set of CCs in the CC group, such a device may identify the set of CCs in the CC group based on the received indication. In some cases, the CC group (e.g., the set of CCs in the CC group) may be identified based on a carrier aggregation configuration, based on channel conditions, based on resource utilization within a wireless communication system, based on the capabilities of UE 115-b (e.g., based on the number of uplink CCs supported by UE 115-b, based on the number of downlink CCs supported by UE 115-b, etc.), based on the analog beamforming panel, antenna panel, antenna array, etc. of UE115-a and / or base station 105-a. For example, in some cases, the set of CCs in the CC group may share an analog beamformer at UE 115-b, an analog beamformer at base station 105-b, or both.

[0091] At 410, the device may identify a default beam applicable to each of the CCs in the set of CCs in the CC group (e.g., the device may identify a common default beam applicable to all CCs in the CC group). For example, at 410-a, UE 115-b may identify a default beam applicable to each of the CCs in the set of CCs in the CC group. Additionally, at 410-b, base station 105-b may identify a default beam applicable to each of the CCs in the set of CCs in the CC group. UE 115-b and base station 105-b may identify a default beam (common default beam) applicable to the CC group (applicable to each of the CCs in the set of CCs in the CC group) according to various techniques described herein. For example, UE 115-b and / or base station 105-b may be based on the lowest CORESET ID (as described in more detail herein, for example, with reference to Figure 3 described in more detail), based on the configured primary cell (PCell) / secondary cell (SCell) (as described in more detail herein, for example, with reference to Figure 3 described in more detail), based on the lowest CC index / highest CC index associated with the set of CCs (as described in more detail herein, for example, with reference to Figure 3The default beam for the CC group is identified by, among other things (described in more detail), etc. In some cases, UE 115-b can identify one or more TCI states that are active for the cell associated with base station 105-b, where the default beam can be identified at least in part based on the lowest TCI state ID among the identified one or more TCI states that are active for the cell.

[0092] In some examples, base station 105-b can determine or identify the default beam, and base station 105-b can transmit an indication of the identified default beam to UE 115-b. For example, base station 105-b can transmit RRC signaling, MAC CE, DCI, or any combination thereof to configure / indicate the default beam for the CC group (e.g., to UE 115-b). In some cases, the default beam can be identified based on common TCI state or spatial relation information. In some examples (e.g., in a scenario where base station 105-b employs multiple TRPs), a common default beam, multiple default beams (default beams can be identified / established for each TRP) can be established for simultaneous receive / transmit communications. In some examples, the default beam can be identified based on SDM mode or configuration, TDM mode or configuration, FDM mode or configuration, or some combination thereof (e.g., across all CCs in the same group, default beam 1 and default beam 2 can be used on odd-numbered symbols in each time slot, and default beam 3 and default beam 4 can be used on even-numbered symbols in each time slot).

[0093] In some examples, when the scheduling offset between DCI and the scheduled PDSCH is less than the beam switching latency (where the beam switching latency can be reported as UE 115-b capability in some cases), the default PDSCH beam can be used to receive the PDSCH. When the CC has a configured CORESET, the default PDSCH beam can be determined by a quasi-co-location (QCL) hypothesis regarding receiving the CORESET with the lowest CORESET ID in the most recently monitored time slot on the same CC. When the CC does not have a configured CORESET, the default PDSCH beam can be determined by the QCL type D reference signal (RS) in the activated PDSCH TCI state with the lowest TCI state ID on the same CC.

[0094] At 415, the devices may communicate with each other based on the identified default beam and at least one CC in the CC set (e.g., UE 115-b may communicate with base station 105-b, and vice versa). For example, UE 115-b and base station 105-b may communicate using any CC in the CC set, any combination of CCs within the CC set, or all CCs within the CC set (according to some carrier aggregation configuration, etc.) based on the identified default beam (since all CCs in the CC set may be associated with the same common default beam).

[0095] Figure 5 FIG. 500 illustrates a device 505 supporting a common default beam per CC group in accordance with aspects of the present disclosure. Device 505 may be an example of aspects of a device as described herein (e.g., UE 115 and / or base station 105). Device 505 may include a receiver 510, a communication manager 515, and a transmitter 520. Device 505 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0096] The receiver 510 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 a common default beam per CC group). The information may be passed to other components of device 505. The receiver 510 may be an example of aspects of the transceiver 820 described with reference to Figure 8 The receiver 510 may utilize a single antenna or an antenna array.

[0097] The communication manager 515 may identify a set of component carriers in a component carrier group; identify a default beam applicable to each component carrier in the set of component carriers in the component carrier group; and communicate with a second device based on the identified default beam and at least one component carrier in the component carrier set. The communication manager 515 may be an example of aspects of the communication manager 810 described herein.

[0098] The communication manager 515 or its sub-components 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 515 or its sub-components 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.

[0099] The communication manager 515 or its sub-components may be physically located at various positions, including being distributed such that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, in accordance with various aspects of the present disclosure, the communication manager 515 or its sub-components may be separate and distinct components. In some examples, in accordance with various aspects of the present disclosure, the communication manager 515 or its sub-components may be combined with one or more other hardware components, the 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 combinations thereof.

[0100] The transmitter 520 may transmit signals generated by other components of the device 505. In some examples, the transmitter 520 may co-reside in a transceiver module with the receiver 510. For example, the transmitter 520 may be an example of aspects of the transceiver 820 described with reference to Figure 8 The transmitter 520 may utilize a single antenna or an antenna array.

[0101] Figure 6 FIG. 600 illustrates an example of a device 605 supporting a common default beam per CC group in accordance with aspects of the present disclosure. The device 605 may be an example of aspects of the device 505, UE 115, and / or base station 105 described herein. The device 605 may include a receiver 610, a communication manager 615, and a transmitter 635. The device 605 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0102] 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 a common default beam per CC group, 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 820 described with reference to Figure 8 The receiver 610 may utilize a single antenna or an antenna array.

[0103] The communication manager 615 may be an example of aspects of the communication manager 515 described herein. The communication manager 615 may include a CC manager 620, a default beam manager 625, and a communication beam manager 630. The communication manager 615 may be an example of aspects of the communication manager 810 described herein.

[0104] CC manager 620 may identify a set of component carriers in a component carrier group. The default beam manager 625 may identify a default beam applicable to each component carrier in the set of component carriers in the component carrier group. The communication beam manager 630 may communicate with a second device based on the identified default beam and at least one component carrier in the set of component carriers.

[0105] Transmitter 635 may transmit signals generated by other components of device 605. In some examples, transmitter 635 may be co-located with receiver 610 in a transceiver module. For example, transmitter 635 may be an example of aspects of transceiver 820 described with reference to Figure 8 Transmitter 635 may utilize a single antenna or an antenna array.

[0106] Figure 7 FIG. 700 illustrates a communication manager 705 supporting a common default beam per CC group in accordance with aspects of the present disclosure. Communication manager 705 may be an example of aspects of communication manager 515, communication manager 615, or communication manager 810 described herein. Communication manager 705 may include a CC manager 710, a default beam manager 715, a communication beam manager 720, a CC group manager 725, and a TCI state manager 730. Each of these modules may communicate directly or indirectly with each other (e.g., via one or more buses).

[0107] CC manager 710 may identify a set of component carriers in a component carrier group. In some cases, the set of component carriers shares an analog beamformer at a first device. In some cases, the set of component carriers shares an analog beamformer at a second device.

[0108] Default beam manager 715 may identify a default beam applicable to each component carrier in the set of component carriers in the component carrier group. In some examples, default beam manager 715 may identify the default beam based on the lowest control resource set identifier. In some examples, default beam manager 715 may identify the default beam based on a configured primary cell. In some examples, default beam manager 715 may identify the default beam based on a configured secondary cell. In some examples, default beam manager 715 may identify the default beam based on the lowest component carrier index associated with the set of component carriers. In some examples, default beam manager 715 may identify the default beam based on the highest component carrier index associated with the set of component carriers. In some examples, default beam manager 715 may transmit an indication of the identified default beam to a second device, wherein the communication is based on the transmitted indication. In some examples, default beam manager 715 may transmit a set of multiple default beams for simultaneous transmit / receive communication with a second device.

[0109] In some examples, the default beam manager 715 may identify the default beam based on a spatial division multiplexing mode, a time division multiplexing mode, a frequency division multiplexing mode, or some combination thereof. In some examples, the default beam manager 715 may receive an indication of the default beam from a second device, where the default beam is identified based on the received indication. In some cases, the indication of the identified default beam includes a common transport configuration indication state. In some cases, the indication of the identified default beam includes spatial relationship information. In some cases, each default beam in the set of multiple default beams corresponds to a transmit / receive point of the first device. In some cases, the default beam includes a default uplink beam, a default downlink beam, or both. In some cases, the default beam manager 715 may determine a path loss of the default beam; and associate the determined path loss with one or more other component carriers in the set of component carriers. In some cases, the default beam manager 715 may associate the determined path loss across component carriers of the transmit / receive point to which the default beam belongs.

[0110] The communication beam manager 720 may communicate with the second device based on the identified default beam and at least one component carrier in the set of component carriers.

[0111] The CC group manager 725 may transmit an indication of the identified set of component carriers included in the component carrier group. In some examples, the CC group manager 725 may receive an indication of the set of component carriers included in the component carrier group, where the set of component carriers in the component carrier group is identified based on the received indication.

[0112] The TCI state manager 730 may identify one or more transport configuration indication states that are active for a cell associated with the second device, where the default beam is identified based on the lowest transport configuration indication state identifier among the identified one or more transport configuration indication states that are active for the cell.

[0113] Figure 8 A diagram illustrating a system 800 including a device 805 that supports a common default beam per CC group, in accordance with aspects of the present disclosure. The device 805 may be an example of or include components of the device 505, the device 605, the UE 115, and / or the base station 105 as described herein. The device 805 may include components for two-way voice and data communication, which include components for transmitting and receiving communications, including a communication manager 810, an I / O controller 815, a transceiver 820, an antenna 825, a memory 830, and a processor 840. These components may be in electronic communication via one or more buses (e.g., bus 845).

[0114] The communication manager 810 may identify a set of component carriers in a component carrier group; identify a default beam applicable to each component carrier in the set of component carriers in the component carrier group; and communicate with a second device based on the identified default beam and at least one component carrier in the set of component carriers.

[0115] The I / O controller 815 may manage the input and output signals of the device 805. The I / O controller 815 may also manage peripheral devices not integrated into the device 805. In some cases, the I / O controller 815 may represent a physical connection or port to an external peripheral device. In some cases, the I / O controller 815 may utilize an operating system, such as or another known operating system. In other cases, the I / O controller 815 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, the I / O controller 815 may be implemented as part of a processor. In some cases, a user may interact with the device 805 via the I / O controller 815 or via a hardware component controlled by the I / O controller 815.

[0116] The transceiver 820 may perform two-way communication via one or more antennas, wired or wireless links, as described above. For example, the transceiver 820 may represent a wireless transceiver and may perform two-way communication with another wireless transceiver. The transceiver 820 may also include a modem to modulate packets and provide the modulated packets to the antenna for transmission, and to demodulate packets received from the antenna.

[0117] In some cases, the wireless device may include a single antenna 825. However, in some cases, the device may have more than one antenna 825, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.

[0118] The memory 830 may include RAM and ROM. The memory 830 may store computer-readable, computer-executable code or software 835 including instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, the memory 830 may particularly include the BIOS, which may control basic hardware or software operations, such as interactions with peripheral components or devices.

[0119] The processor 840 may include intelligent hardware devices (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, the processor 840 may be configured to operate the memory array using a memory controller. In other cases, the memory controller may be integrated into the processor 840. The processor 840 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 830) to cause the device 805 to perform various functions (e.g., functions or tasks supporting a common default beam for each CC group).

[0120] The software 835 may include instructions for implementing aspects of the present disclosure, including instructions for supporting wireless communication. The software 835 may be stored in a non-transitory computer-readable medium, such as system memory or other types of memory. In some cases, the software 835 may not be directly executable by the processor 840, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0121] As discussed herein, the device 805 may illustrate aspects of the base station 105, the UE 115, or both. Thus, additional components may be added to the device 805, or in some cases, some components may not be included in the device 805. As an example, in the case where the device 805 illustrates the base station 105, such a device may further include a network communication manager and an inter-station communication manager. The network communication manager may manage communication with the core network (e.g., with the core network 130 via one or more wired backhaul links). For example, the network communication manager may manage the delivery of data communication for client devices (such as one or more UEs 115). The inter-station communication manager may manage communication with other base stations 105 and may include a controller or scheduler for coordinating communication with the UEs 115 in cooperation with other base stations 105. For example, the inter-station communication manager may coordinate the scheduling of transmissions to the UEs 115 for various interference mitigation techniques (such as beamforming or joint transmission). In some examples, the inter-station communication manager may provide an X2 interface within the LTE / LTE-A wireless communication network technology to provide communication between the base stations 105.

[0122] Figure 9 A flowchart of a method 900 for supporting a common default beam for each CC group in accordance with aspects of the present disclosure is illustrated. The operations of the method 900 may be implemented by a device or its components as described herein. For example, the operations of the method 900 may be performed by a device as referred to in Figures 5 to 8The described communication manager performs the operations. In some examples, the device may execute an instruction set to control functional elements of the device to perform the following functions. Additionally or alternatively, the device may use dedicated hardware to perform aspects of the following functions.

[0123] At 905, the device may identify a set of component carriers in a component carrier group. The operation at 905 may be performed according to the methods described herein. In some examples, aspects of the operation at 905 may be performed by a CC manager as described with reference to Figures 5 to 8 what is described.

[0124] At 910, the device may identify a default beam applicable to each component carrier in the set of component carriers in the component carrier group. The operation at 910 may be performed according to the methods described herein. In some examples, aspects of the operation at 910 may be performed by a default beam manager as described with reference to Figures 5 to 8 what is described.

[0125] At 915, the device may communicate with a second device based on the identified default beam and at least one component carrier in the set of component carriers. The operation at 915 may be performed according to the methods described herein. In some examples, aspects of the operation at 915 may be performed by a communication beam manager as described with reference to Figures 5 to 8 what is described.

[0126] Figure 10 A flowchart of a method 1000 supporting a common default beam per CC group in accordance with aspects of the present disclosure is illustrated. The operations of method 1000 may be implemented by a device or components thereof as described herein. For example, the operations of method 1000 may be performed by a communication manager as described with reference to Figures 5 to 8 what is described. The device may execute an instruction set to control functional elements of the device to perform the following functions. Additionally or alternatively, the device may use dedicated hardware to perform aspects of the following functions.

[0127] At 1005, the device may identify a set of component carriers in a component carrier group. The operation at 1005 may be performed according to the methods described herein. In some examples, aspects of the operation at 1005 may be performed by a CC manager as described with reference to Figures 5 to 8 what is described.

[0128] At 1010, the device may identify a default beam applicable to each component carrier in the set of component carriers in the component carrier group. The operation at 1010 may be performed according to the methods described herein. In some examples, aspects of the operation at 1010 may be performed by a default beam manager as described with reference to Figures 5 to 8 what is described.

[0129] At 1015, the device may transmit an indication of the identified default beam to a second device. The operation of 1015 may be performed according to the methods described herein. In some examples, aspects of the operation of 1015 may be performed by a default beam manager as described with reference to Figures 5 to 8 the described default beam manager.

[0130] For example, in an example where the operations of method 1000 may be implemented by a base station 105 or its components as described herein, the indication may include information such as a set of multiple default beams for simultaneous transmit / receive communication with the second device (e.g., each default beam in the set of multiple default beams may correspond to a TRP of the device). In some cases, the indication may include information such as spatial relationship information, common transmission configuration indication status, and the like.

[0131] At 1020, the device may communicate with the second device based on the identified default beam and at least one component carrier in the set of component carriers. The operation of 1020 may be performed according to the methods described herein. In some examples, aspects of the operation of 1020 may be performed by a communication beam manager as described with reference to Figures 5 to 8 the described communication beam manager.

[0132] It should be noted that the methods described herein describe possible implementations, and the operations and steps may be rearranged or otherwise modified and other implementations are possible. In addition, aspects from two or more methods may be combined.

[0133] 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. CDMA systems may implement radio technologies such as CDMA2000, universal terrestrial radio access (UTRA), etc. CDMA2000 covers standards such as IS-2000, IS-95, and IS-856. The IS-2000 version is often referred to as CDMA2000 1X, 1X, etc. IS-856 (TIA-856) is commonly referred to as CDMA2000 1xEV-DO, high rate packet data (HRPD), etc. UTRA includes wideband CDMA (WCDMA) and other CDMA variants. TDMA systems may implement radio technologies such as the global system for mobile communications (GSM).

[0134] OFDMA systems can 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, etc. UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS). LTE, LTE-A, and LTE-A Pro are UMTS versions that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, LTE-A Pro, NR, and GSM are described in literature from an organization called the "3rd Generation Partnership Project" (3GPP). CDMA2000 and UMB are described in literature from an organization called the "3rd Generation Partnership Project 2" (3GPP2). The techniques described herein can be used for the systems and radio technologies mentioned herein, as well as for other systems and radio technologies. Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for illustrative purposes and the terms LTE, LTE-A, LTE-A Pro, or NR may be used in most of the description, the techniques described herein can also be applied to applications other than LTE, LTE-A, LTE-A Pro, or NR applications.

[0135] Macro cells generally cover a relatively large geographical area (e.g., with a radius of several kilometers) and can allow unconstrained access by UEs having a service subscription with the network provider. Small cells can be associated with a lower power base station (compared to macro cells), and small cells can operate in the same or different (e.g., licensed, unlicensed, etc.) frequency bands as macro cells. According to various examples, small cells can include picocells, femtocells, and microcells. Picocells, for example, can cover a smaller geographical area and can allow unconstrained access by UEs having a service subscription with the network provider. Femtocells can also cover a smaller geographical area (e.g., a residence) and can provide constrained access by UEs associated with the femtocell (e.g., UEs in a Closed Subscriber Group (CSG), UEs of users in the residence, etc.). The eNB for a macro cell can be referred to as a macro eNB. The eNB for a small cell can be referred to as a small cell eNB, pico eNB, femto eNB, or home eNB. An eNB can support one or more (e.g., two, three, four, etc.) cells and can also support communication using one or more component carriers.

[0136] The wireless communication systems described herein can support synchronous or asynchronous operations. For synchronous operations, each base station may have similar frame timing, and transmissions from different base stations can be approximately aligned in time. For asynchronous operations, each base station may have different frame timing, and transmissions from different base stations may not be aligned in time. The techniques described herein can be used for synchronous or asynchronous operations.

[0137] The information and signals described herein can be represented using any of a variety of different arts and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout this description can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or optical particles, or any combination thereof.

[0138] The various illustrative blocks and modules described in connection with the disclosure herein can be implemented or performed 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 designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in the 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, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0139] The functions described herein can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions can be stored on or transmitted via a computer-readable medium as one or more instructions or code. Other examples and implementations fall within the scope of the present disclosure and the appended claims. For example, due to the nature of software, the functions described herein can be implemented using software, hardware, firmware, hardwiring, or any combination thereof executed by a processor. The features implementing the functions can also be physically located in various positions, including being distributed such that portions of the functions are implemented at different physical locations. As used herein (including in the claims), the term "and / or" in the listing of two or more items means that any one of the listed items can be employed alone or any combination of two or more of the listed items can be employed. For example, if a composition is described as including components A, B, and / or C, the composition can include only A; only B; only C; a combination of A and B; a combination of A and C; a combination of B and C; or a combination of A, B, and C. Similarly, as used herein (including in the claims), the term "or" in a listing of items (e.g., in a listing of items followed by phrases such as "at least one of" or "one or more of") indicates a disjunctive listing such that, for example, the listing "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).

[0140] A computer-readable medium includes both a non-transitory computer storage medium and a communication medium including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium may be any available medium that can be accessed by a general purpose or special purpose computer. By way of example, and not limitation, non-transitory computer-readable media may include random access memory (RAM), read only memory (ROM), electrically erasable programmable ROM (EEPROM), flash memory, compact disc ROM (CD-ROM) or other optical disc storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a general purpose or special purpose computer, or a general purpose or special purpose processor. Likewise, any connection is properly termed a computer-readable medium. For example, if software is transmitted from a website, server, or other remote source using a 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 included in the definition of the medium. As used herein, disk and disc include CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk, and Blu-ray disc, where disks typically reproduce data magnetically and discs reproduce data optically with lasers. Combinations of the above media are also included within the scope of computer-readable media.

[0141] As used herein, including in the claims, the "or" in a list of items (e.g., a list of items followed by phrases such as "at least one of" or "one or more of") indicates an inclusive listing such that, for example, the listing 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). Likewise, as used herein, the phrase "based on" should not be construed as reciting a closed set of conditions. For example, an exemplary step described as "based on condition A" may be based on both condition A and condition B without departing from the scope of the disclosure. In other words, as used herein, the phrase "based on" should be construed in the same manner as the phrase "at least partially based on".

[0142] In the figures, like components or features may have the same reference numeral. Additionally, each of the same type of components may be distinguished by following the reference numeral with a dash and a second label that differentiates among the similar components. If only the first reference numeral is used in the specification, the description may apply to any one of the similar components having the same first reference numeral regardless of the second reference numeral, or any other subsequent reference numerals.

[0143] The description set forth herein with reference to the drawings describes exemplary configurations and does not represent all examples that may be implemented or that fall within the scope of the claims. The term "exemplary" as used herein means "serving as an example, instance, or illustration" and does not mean "superior to" or "better than" other examples. This detailed description includes specific details to provide an understanding of the described techniques. However, the techniques may be practiced without these specific details. In some instances, well-known structures and devices are shown in schematic form to avoid obscuring the concepts of the described examples.

[0144] The description provided herein is to enable a person 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, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Thus, the present disclosure is not limited to the examples and designs described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a first device, comprising: Identifying a set of component carriers in a component carrier group; Identifying a common default beam applicable to each component carrier in the set of component carriers in the component carrier group; Transmitting an indication of a set of multiple default beams for simultaneous transmit / receive communication with a second device, wherein the set of multiple default beams includes one or more common downlink default beams and one or more common uplink default beams, and wherein the identified common default beam includes the set of multiple default beams; And Communicating with the second device at least in part based on the identified common default beam and at least one component carrier in the set of component carriers.

2. The method according to claim 1, further comprising: Transmitting an indication of the identified set of component carriers included in the component carrier group.

3. The method according to claim 1, further comprising: Receiving an indication of the set of component carriers included in the component carrier group, wherein the set of component carriers in the component carrier group is identified at least in part based on the received indication of the set of component carriers.

4. The method according to claim 1, wherein identifying the common default beam includes: Identifying the common default beam at least in part based on the lowest control resource set identifier.

5. The method according to claim 1, wherein identifying the common default beam includes: Identifying the common default beam at least in part based on the configured primary cell.

6. The method according to claim 1, wherein identifying the common default beam includes: Identifying the common default beam at least in part based on the configured secondary cell.

7. The method according to claim 1, wherein identifying the common default beam includes: Identifying the common default beam at least in part based on the lowest component carrier index associated with the set of component carriers.

8. The method according to claim 1, wherein identifying the common default beam includes: Identifying the common default beam at least in part based on the highest component carrier index associated with the set of component carriers.

9. The method according to claim 1, further comprising: Identifying one or more transmission configuration indication states that are active for a cell associated with the second device, wherein the common default beam is identified at least in part based on the lowest transmission configuration indication state identifier among the identified one or more transmission configuration indication states that are active for the cell.

10. The method according to claim 1, wherein the indication of the identified common default beam includes a common transmission configuration indication state.

11. The method according to claim 1, wherein the indication of the identified common default beam includes spatial relation information.

12. The method according to claim 1, wherein each default beam in the set of multiple default beams corresponds to a transmit / receive point of the first device.

13. The method according to claim 1, wherein identifying the common default beam includes: Identify the common default beam at least partially based on a spatial division multiplexing mode, a time division multiplexing mode, a frequency division multiplexing mode, or some combination thereof.

14. The method according to claim 1, further comprising: Receiving an indication of the common default beam from the second device, wherein the common default beam is identified at least partially based on the received indication of the common default beam.

15. The method according to claim 1, wherein the set of component carriers shares an analog beamformer at the first device.

16. The method according to claim 1, wherein the set of component carriers shares an analog beamformer at the second device.

17. The method according to claim 1, wherein the common default beam includes a default uplink beam, a default downlink beam, or both.

18. The method according to claim 1, further comprising: Determining a path loss of the common default beam; And Associating the determined path loss with one or more other component carriers in the set of component carriers.

19. The method according to claim 18, further comprising: Associating the determined path loss across the component carriers of the transmission / reception point to which the common default beam belongs.

20. An apparatus for wireless communication at a first device, comprising: A processor; A memory coupled to the processor; And Instructions stored in the memory and executable by the processor to cause the apparatus to: Identify a set of component carriers in a component carrier group; Identify a common default beam applicable to each component carrier in the set of component carriers in the component carrier group; Transmit an indication of a set of multiple default beams for simultaneous transmission / reception communication with a second device, wherein the set of multiple default beams includes one or more common downlink default beams and one or more common uplink default beams, and wherein the identified common default beam includes the set of multiple default beams; And Communicate with the second device at least partially based on the identified common default beam and at least one component carrier in the set of component carriers.

21. The apparatus according to claim 20, wherein the instructions can be further executed by the processor to cause the apparatus to: Transmit an indication of the identified set of component carriers included in the component carrier group.

22. The apparatus according to claim 20, wherein the instructions can be further executed by the processor to cause the apparatus to: Receive an indication of the identified set of component carriers included in the component carrier group, wherein the set of component carriers in the component carrier group is identified at least partially based on the received indication of the set of component carriers.

23. The apparatus according to claim 20, wherein the instructions for identifying the common default beam can be executed by the processor to cause the apparatus to: Identify the common default beam at least partially based on a lowest control resource set identifier.

24. The apparatus according to claim 20, wherein the instructions for identifying the common default beam are executable by the processor to cause the apparatus to: Identify the common default beam at least in part based on the configured primary cell.

25. The apparatus according to claim 20, wherein the instructions for identifying the common default beam are executable by the processor to cause the apparatus to: Identify the common default beam at least in part based on the configured secondary cell.

26. The apparatus according to claim 20, wherein the instructions for identifying the common default beam are executable by the processor to cause the apparatus to: Identify the common default beam at least in part based on the lowest component carrier index associated with the set of component carriers.

27. The apparatus according to claim 20, wherein the instructions for identifying the common default beam are executable by the processor to cause the apparatus to: Identify the common default beam at least in part based on the highest component carrier index associated with the set of component carriers.

28. The apparatus according to claim 20, wherein the instructions are further executable by the processor to cause the apparatus to: Identify one or more transmission configuration indication states that are active for a cell associated with the second device, wherein the common default beam is identified at least in part based on the lowest transmission configuration indication state identifier among the identified one or more transmission configuration indication states that are active for the cell.

29. The apparatus according to claim 20, wherein the indication of the identified common default beam includes a common transmission configuration indication state.

30. The apparatus according to claim 20, wherein the indication of the identified common default beam includes spatial relationship information.

31. The apparatus according to claim 20, wherein each default beam in the set of multiple default beams corresponds to a transmit / receive point of the first device.

32. The apparatus according to claim 20, wherein the instructions for identifying the common default beam are executable by the processor to cause the apparatus to: Identify the common default beam at least in part based on a spatial division multiplexing mode, a time division multiplexing mode, a frequency division multiplexing mode, or some combination thereof.

33. The apparatus according to claim 20, wherein the instructions are further executable by the processor to cause the apparatus to: Receive an indication of the common default beam from the second device, wherein the common default beam is identified at least in part based on the received indication of the common default beam.

34. The apparatus according to claim 20, wherein the set of component carriers shares an analog beamformer at the first device.

35. The apparatus according to claim 20, wherein the set of component carriers shares an analog beamformer at the second device.

36. The apparatus according to claim 20, wherein the common default beam includes a default uplink beam, a default downlink beam, or both.

37. The apparatus according to claim 20, wherein the instructions are further executable by the processor to cause the apparatus to: Determine the path loss of the shared default beam; and Associate the determined path loss with one or more other component carriers in the set of component carriers.

38. The apparatus according to claim 37, wherein the instructions can be further executed by the processor to cause the apparatus to: Associate the determined path loss across the component carriers of the transmission / reception point to which the shared default beam belongs.

39. An apparatus for wireless communication at a first device, comprising: Means for identifying a set of component carriers in a component carrier group; Means for identifying a shared default beam applicable to each component carrier in the set of component carriers in the component carrier group; Means for transmitting an indication of a set of multiple default beams for simultaneous transmission / reception communication with a second device, wherein the set of multiple default beams includes one or more shared downlink default beams and one or more shared uplink default beams, and wherein the identified shared default beam includes the set of multiple default beams; And Means for communicating with the second device at least in part based on the identified shared default beam and at least one component carrier in the set of component carriers.

40. The apparatus according to claim 39, further comprising: Means for transmitting an indication of the identified set of component carriers included in the component carrier group.

41. The apparatus according to claim 39, further comprising: Means for receiving an indication of the identified set of component carriers included in the component carrier group, wherein the set of component carriers in the component carrier group is identified at least in part based on the received indication of the set of component carriers.

42. The apparatus according to claim 39, wherein the means for identifying the shared default beam includes: Means for identifying the shared default beam at least in part based on the lowest control resource set identifier.

43. The apparatus according to claim 39, wherein the means for identifying the shared default beam includes: Means for identifying the shared default beam at least in part based on the configured primary cell.

44. The apparatus according to claim 39, wherein the means for identifying the shared default beam includes: Means for identifying the shared default beam at least in part based on the configured secondary cell.

45. The apparatus according to claim 39, wherein the means for identifying the shared default beam includes: Means for identifying the shared default beam at least in part based on the lowest component carrier index associated with the set of component carriers.

46. The apparatus according to claim 39, wherein the means for identifying the shared default beam includes: Means for identifying the shared default beam at least in part based on the highest component carrier index associated with the set of component carriers.

47. The apparatus according to claim 39, further comprising: Apparatus for identifying one or more transmission configuration indication states that are active for a cell associated with the second device, wherein the common default beam is identified at least in part based on the lowest transmission configuration indication state identifier among the identified one or more transmission configuration indication states that are active for the cell.

48. The apparatus of claim 39, wherein the indication of the identified common default beam includes a common transmission configuration indication state.

49. The apparatus of claim 39, wherein the indication of the identified common default beam includes spatial relationship information.

50. The apparatus of claim 39, wherein each default beam in the set of multiple default beams corresponds to a transmit / receive point of the first device.

51. The apparatus of claim 39, wherein the means for identifying the common default beam includes: Means for identifying the common default beam at least in part based on a spatial division multiplexing mode, a time division multiplexing mode, a frequency division multiplexing mode, or some combination thereof.

52. The apparatus of claim 39, further comprising: Means for receiving an indication of the common default beam from the second device, wherein the common default beam is identified at least in part based on the received indication of the common default beam.

53. The apparatus of claim 39, wherein the set of component carriers shares an analog beamformer at the first device.

54. The apparatus of claim 39, wherein the common default beam includes a default uplink beam, a default downlink beam, or both.

55. The apparatus of claim 39, further comprising: Means for determining a path loss of the common default beam; And Means for associating the determined path loss with one or more other component carriers in the set of component carriers.

56. The apparatus of claim 55, further comprising: Means for associating the determined path loss across component carriers of a transmit / receive point to which the common default beam belongs.

57. A non-transitory computer-readable medium storing code for wireless communication at a first device, the code including instructions executable by a processor to: Identify a set of component carriers in a component carrier group; Identify a common default beam applicable to each component carrier in the set of component carriers in the component carrier group; Transmit an indication of a set of multiple default beams for simultaneous transmit / receive communication with a second device, wherein the set of multiple default beams includes one or more common downlink default beams and one or more common uplink default beams, and wherein the identified common default beam includes the set of multiple default beams; And Communicate with the second device at least in part based on the identified common default beam and at least one component carrier in the set of component carriers.

58. The non-transitory computer-readable medium of claim 57, wherein the instructions can be further executed to: Identify one or more transmission configuration indication states that are active for a cell associated with the second device, wherein the common default beam is identified at least in part based on the lowest transmission configuration indication state identifier among the identified one or more transmission configuration indication states that are active for the cell.

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